Summary
Connects to five UK government registers for corporate due diligence without paywalls. Pulls company profiles, director appointments, beneficial ownership chains, and disqualification records from Companies House. Checks charity financials and trustees via the Charity Commission API. Queries HMLR for property ownership through SPARQL, scrapes insolvency notices from The Gazette's linked data feed, and validates VAT numbers against HMRC. Includes three orchestration prompts that chain searches across registers. Useful for KYC checks, investor due diligence, or flagging phoenix company patterns. The hosted endpoint needs no API keys, but local installs require free Companies House and Charity Commission credentials. Covers England and Wales only for land registry queries.
Install to Claude Code
verifiedclaude mcp add --transport http uk-due-diligence-mcp https://uk-due-diligence-mcp.fly.dev/mcpRun in your terminal. Add --scope user to make it available in every project.
Review the command, arguments, and environment values before installing — MCP servers run with your local permissions.
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Verified live against the running server on Jun 10, 2026.
verified live16 tools
company_searchSearch the Companies House register by company name or keyword. Returns a paginated list of matching companies with name, number, status, SIC codes, incorporation date, and registered address. Use company_profile for the full record once you have the company number. Re-call wi...5 params
Search the Companies House register by company name or keyword. Returns a paginated list of matching companies with name, number, status, SIC codes, incorporation date, and registered address. Use company_profile for the full record once you have the company number. Re-call wi...
Parameters* required
company_statusvalueFilter by company status (e.g. 'active', 'dissolved'). Omit to search all.
company_typevalueFilter by company type (e.g. 'ltd', 'llp'). Omit to search all.
items_per_pageintegerNumber of results to return (max 100). Default 20.default: 20
query*stringCompany name or keyword to search for
start_indexintegerPagination offset. Default 0.default: 0
company_profileFetch the full Companies House profile for a company number. Returns status, registered address, SIC codes, filing compliance (overdue accounts and confirmation statement flags), and whether the company has outstanding charges. Use company_search first to find the company number.1 params
Fetch the full Companies House profile for a company number. Returns status, registered address, SIC codes, filing compliance (overdue accounts and confirmation statement flags), and whether the company has outstanding charges. Use company_search first to find the company number.
Parameters* required
company_number*stringCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.
company_officersFetch active officers for a Companies House company number. Returns directors, secretaries, and other active officers with appointment dates, nationality, and country of residence. Resigned officers are excluded. Pagination is handled internally — do NOT pass items_per_page or...3 params
Fetch active officers for a Companies House company number. Returns directors, secretaries, and other active officers with appointment dates, nationality, and country of residence. Resigned officers are excluded. Pagination is handled internally — do NOT pass items_per_page or...
Parameters* required
company_number*stringCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.
items_per_pagevalueIgnored — pagination is handled internally. Only accepted to avoid call failures.
start_indexvalueIgnored — all officers are returned in one call.
company_pscFetch Persons with Significant Control (beneficial ownership) for a company. Returns PSC entries with natures of control, nationality, and country of residence. Flags overseas corporate PSC entries as a beneficial ownership risk signal. Returns an explanatory note for widely-h...1 params
Fetch Persons with Significant Control (beneficial ownership) for a company. Returns PSC entries with natures of control, nationality, and country of residence. Flags overseas corporate PSC entries as a beneficial ownership risk signal. Returns an explanatory note for widely-h...
Parameters* required
company_number*stringCompanies House company number (8 digits, e.g. '03782379'). Returned by company_search.
charity_searchSearch the Charity Commission register of England and Wales by name or keyword. Returns matching charities with registration number, status, and registration date. Use charity_profile for full details once you have the charity number. The upstream `searchCharityName` endpoint...3 params
Search the Charity Commission register of England and Wales by name or keyword. Returns matching charities with registration number, status, and registration date. Use charity_profile for full details once you have the charity number. The upstream `searchCharityName` endpoint...
Parameters* required
limitintegerMax items to return in this page. Default 20; raise to 100 for bulk views.default: 20
offsetintegerNumber of items to skip before this page. Default 0.default: 0
query*stringCharity name or keyword to search for
charity_profileFetch the full Charity Commission profile for a charity number. Returns trustees, latest income/expenditure, insolvency flags, governing document type, classifications, and countries of operation. Use charity_search first to find the charity number.1 params
Fetch the full Charity Commission profile for a charity number. Returns trustees, latest income/expenditure, insolvency flags, governing document type, classifications, and countries of operation. Use charity_search first to find the charity number.
Parameters* required
charity_number*stringCharity Commission registration number (e.g. '1234567'). Returned by charity_search.
disqualified_searchCheck whether a named individual is banned from acting as a UK company director. Use this tool when asked to check disqualified, banned, or barred directors. Query must be an individual's name (e.g. "Richard Howson") — NOT a company name, which always returns zero results. Ret...3 params
Check whether a named individual is banned from acting as a UK company director. Use this tool when asked to check disqualified, banned, or barred directors. Query must be an individual's name (e.g. "Richard Howson") — NOT a company name, which always returns zero results. Ret...
Parameters* required
items_per_pageintegerResults per page (max 100). Default 20.default: 20
query*stringName of the person to search for
start_indexintegerPagination offset (0-based). Default 0.default: 0
disqualified_profileFetch the full disqualification record for a director by officer ID. Returns all disqualification orders: reason, Act/section cited, disqualification period, and associated company names. Use disqualified_search first to find the officer ID.1 params
Fetch the full disqualification record for a director by officer ID. Returns all disqualification orders: reason, Act/section cited, disqualification period, and associated company names. Use disqualified_search first to find the officer ID.
Parameters* required
officer_id*stringCompanies House officer ID. Returned by disqualified_search.
land_title_searchSearch HM Land Registry Price Paid Index by postcode or address. Returns up to 10 recent sale transactions for the postcode: price, date, address, property type, and tenure (Freehold/Leasehold). Covers England and Wales only. Postcode gives the most reliable results — a full a...1 params
Search HM Land Registry Price Paid Index by postcode or address. Returns up to 10 recent sale transactions for the postcode: price, date, address, property type, and tenure (Freehold/Leasehold). Covers England and Wales only. Postcode gives the most reliable results — a full a...
Parameters* required
address_or_postcode*stringUK property address or postcode. Postcode is most reliable: e.g. 'NG1 1AB'. Full address also accepted.
gazette_noticeFetch the full legal wording of a Gazette notice by numeric notice ID. Returns the complete JSON-LD linked-data record for the notice: parties, legal basis, court, and full text. Use gazette_insolvency first to find notice_numeric_id values.1 params
Fetch the full legal wording of a Gazette notice by numeric notice ID. Returns the complete JSON-LD linked-data record for the notice: parties, legal basis, court, and full text. Use gazette_insolvency first to find notice_numeric_id values.
Parameters* required
notice_id*stringNumeric Gazette notice ID. Returned as notice_numeric_id by gazette_insolvency.
gazette_insolvencySearch The Gazette's insolvency notice index by entity name. Searches the Gazette's insolvency endpoint which covers corporate notice codes: winding-up orders (2443), administration orders (2448), liquidator appointments (2452), striking-off notices (2460), and more. Results a...5 params
Search The Gazette's insolvency notice index by entity name. Searches the Gazette's insolvency endpoint which covers corporate notice codes: winding-up orders (2443), administration orders (2448), liquidator appointments (2452), striking-off notices (2460), and more. Results a...
Parameters* required
end_datevalueFilter notices up to this date (YYYY-MM-DD)
entity_name*stringCompany or individual name to search for in Gazette insolvency notices
max_noticesintegerCap on notices returned, applied after severity/date sort. Default 20. The Gazette insolvency feed returns up to 100 results per search — raise to 100 to see the full set.default: 20
notice_typevalueFilter by notice code (e.g. '2441' winding-up petition, '2443' winding-up order, '2448' administration order, '2460' striking-off). Omit to search all.
start_datevalueFilter notices from this date (YYYY-MM-DD)
vat_validateValidate a UK VAT number against the HMRC register. Returns the trading name and address as registered with HMRC for VAT purposes. The VAT-registered trading address often differs from the Companies House registered address — that discrepancy is a due diligence signal worth no...1 params
Validate a UK VAT number against the HMRC register. Returns the trading name and address as registered with HMRC for VAT purposes. The VAT-registered trading address often differs from the Companies House registered address — that discrepancy is a due diligence signal worth no...
Parameters* required
vat_number*stringUK VAT registration number. Accepts: 'GB123456789', '123456789', 'GB 123 456 789'. GB prefix and spaces normalised automatically.
searchSearch across all UK due diligence registers simultaneously. Searches Companies House, Charity Commission, disqualified directors, and Gazette insolvency notices in parallel. Returns a list of result IDs — use fetch with each ID to retrieve the full record.1 params
Search across all UK due diligence registers simultaneously. Searches Companies House, Charity Commission, disqualified directors, and Gazette insolvency notices in parallel. Returns a list of result IDs — use fetch with each ID to retrieve the full record.
Parameters* required
query*stringCompany name, charity name, director name, or keyword to search for across all UK due diligence registers
fetchFetch the full record for an ID returned by search. Routes by prefix to the appropriate register: - company:{number} → Companies House full profile - charity:{number} → Charity Commission full profile - disqualification:{officer_id} → Disqualified director full record - notice...1 params
Fetch the full record for an ID returned by search. Routes by prefix to the appropriate register: - company:{number} → Companies House full profile - charity:{number} → Charity Commission full profile - disqualification:{officer_id} → Disqualified director full record - notice...
Parameters* required
id*stringPrefixed record ID returned by search. Format: company:{number}, charity:{number}, disqualification:{officer_id}, or notice:{notice_id}
list_promptsList all available prompts. Returns JSON with prompt metadata including name, description, and optional arguments.
List all available prompts. Returns JSON with prompt metadata including name, description, and optional arguments.
No parameters — call it with no arguments.
get_promptGet a prompt by name with optional arguments. Returns the rendered prompt as JSON with a messages array. Arguments should be provided as a dict mapping argument names to values.2 params
Get a prompt by name with optional arguments. Returns the rendered prompt as JSON with a messages array. Arguments should be provided as a dict mapping argument names to values.
Parameters* required
argumentsvalueOptional arguments for the prompt
name*stringThe name of the prompt to get
uk-due-diligence-mcp
Official-source UK due-diligence data for AI agents.
Search Companies House, Charity Commission, The Gazette, HMLR price-paid data and HMRC VAT records, plus screen names against the OFSI, OFAC, EU and UN sanctions lists. Exposes atomic MCP tools for company ownership, officers, cross-company appointment history, secured charges, insolvency notices and related registry evidence — the consuming agent decides how to investigate, not the server.
Every data source is a legally-mandated register with a free official API. Zero paywalls.
Data sources
| Register | API | Auth | Coverage |
|---|---|---|---|
| Companies House | api.company-information.service.gov.uk | API key (free) | UK-wide |
| Charity Commission | api.charitycommission.gov.uk | API key (free) | England & Wales |
| HMLR Land Registry | landregistry.data.gov.uk (SPARQL) | None | England & Wales |
| The Gazette | thegazette.co.uk (Linked Data) | None (read) | UK-wide |
| HMRC VAT | api.service.hmrc.gov.uk | OAuth2 client credentials | UK-wide |
| OFSI / OFAC / EU / UN sanctions | consolidated list files | None | International |
Quick start
Hosted (no install)
{
"mcpServers": {
"uk-due-diligence": {
"type": "http",
"url": "https://uk-due-diligence-mcp.fly.dev/mcp"
}
}
}
Local (uvx)
{
"mcpServers": {
"uk-due-diligence": {
"type": "stdio",
"command": "uvx",
"args": ["uk-due-diligence-mcp"]
}
}
}
See Configuration for the environment variables it needs.
Tools
Companies House
| Tool | Description |
|---|---|
company_search | Search by name/keyword, filter by status/type |
company_profile | Status, filing compliance, registered address, has_charges summary |
company_officers | Directors/secretaries; each carries an officer_id |
company_psc | Beneficial owners, PSC chain, overseas-corporate-PSC flag |
officer_appointments | Full appointment history for a person by officer_id — including dissolved or insolvent companies not named anywhere else |
company_charges | Complete secured-charge history: status, dates, secured parties, what each charge covers |
disqualified_search | Search disqualified directors by name |
disqualified_profile | Full disqualification record: period, Act, associated companies |
Charity Commission
| Tool | Description |
|---|---|
charity_search | Search by name, filter by registration status |
charity_profile | Full record: trustees, income/expenditure, governing document |
HMLR Land Registry
| Tool | Description |
|---|---|
land_title_search | Price Paid Index sale transactions by postcode — not title ownership (see Limitations) |
The Gazette
| Tool | Description |
|---|---|
gazette_insolvency | Corporate insolvency notices across the Gazette's notice-code taxonomy (codes 2401-2465) |
gazette_notice | Full legal wording of a specific notice |
HMRC / Sanctions
| Tool | Description |
|---|---|
vat_validate | Trading name + address as registered for VAT |
sanctions_screen | Screen a name against the OFSI/OFAC/EU/UN consolidated lists |
Cross-register
| Tool | Description |
|---|---|
search | Fan-out search across all registers — returns IDs (for ChatGPT deep research) |
fetch | Fetch a structured record by ID returned from search |
Examples
Resolve "TAS Engineering" to a company number and check whether it has any outstanding charges.
→ company_search to find the company number, then company_charges for the full secured-debt picture (not just the has_charges summary).
Has Gareth Davies (director of company 06333469) been connected to any other companies, including ones that no longer exist?
→ company_officers to get his officer_id, then officer_appointments to surface every company he's held an appointment at, current or historic.
Is "MEL Precision Limited" in the middle of insolvency proceedings, and what does that actually mean legally?
→ gazette_insolvency to find the notices, then gazette_notice to read the full legal wording before drawing conclusions from the notice label alone.
Screen "Acme Trading Ltd" and its officers against sanctions lists.
→ company_officers for the officer names, then sanctions_screen against the company name and each officer.
Limitations
Things worth knowing before trusting output:
land_title_searchreturns Price Paid transactions, not ownership. It does not return current proprietor/title data — HMLR's Price Paid Index only records historic sale transactions.- Sanctions screening is exact/alias matching, not compliance clearance. A company/entity legal name matches reliably; person names with transliteration variants may not. An empty result is not a guarantee of clearance, and a hit on a common name may need disambiguation.
has_charges: nullmeans the check could not be confidently completed — a charges-endpoint outage, or a charge with an unrecognized status. Treat it as unresolved, not as "no charges."officer_appointmentsreturns historical relationships. Companies House doesn't auto-resign a director when a company enters insolvency — checkcompany_statuson each appointment, not justresigned_on.- Official-source data can be incomplete or delayed. These are the same registers a human would check, with the same latency and gaps.
Configuration
| Variable | Required for | Where to get it |
|---|---|---|
CH_API_KEY | All Companies House tools | developer.company-information.service.gov.uk — free |
CHARITY_API_KEY | Charity Commission tools | api-portal.charitycommission.gov.uk — free |
HMRC_CLIENT_ID / HMRC_CLIENT_SECRET | vat_validate | HMRC Developer Hub (developer.service.hmrc.gov.uk) — free, OAuth2 client-credentials app |
HMRC_ENV | vat_validate (optional) | sandbox or production — defaults to production |
HMLR, The Gazette, and the sanctions lists require no credentials.
Project structure
uk-due-diligence-mcp/
├── server.py # FastMCP init, tool/resource registration, transport config
├── companies_house.py # company_search/profile/officers/psc, officer_appointments, company_charges
├── disqualified.py # disqualified_search, disqualified_profile
├── charity.py # charity_search, charity_profile
├── land_registry.py # land_title_search (SPARQL Price Paid Index)
├── gazette.py # gazette_insolvency, gazette_notice
├── hmrc_vat.py # vat_validate (OAuth2 client-credentials)
├── sanctions.py # sanctions_screen (OFSI/OFAC/EU/UN consolidated lists)
├── search_fetch.py # search, fetch (cross-register fan-out)
├── models.py # Pydantic v2 output models
├── http_client.py # Shared httpx clients, retry backoff, error formatting
├── fly.toml
├── Dockerfile
├── pyproject.toml
└── .env.example
Licence
MIT
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Packageuk-due-diligence-mcp
TransportSTDIO, HTTP
Prompts3
Tools verifiedJun 10, 2026
UpdatedApr 20, 2026