uk-due-diligence-mcp

Official-source UK due-diligence data for AI agents.

Search Companies House, Charity Commission, The Gazette and HMLR price-paid data, 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
OFSI / OFAC / EU / UN sanctions	consolidated list files	None	International

Quick start

Hosted (no install)

config.json

{
  "mcpServers": {
    "uk-due-diligence": {
      "type": "http",
      "url": "https://uk-due-diligence-mcp.fly.dev/mcp"
    }
  }
}

Local (uvx)

config.json

{
  "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

Sanctions

Tool	Description
`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

Code

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).

Code

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.

Code

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.

Code

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_search returns 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: null means 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_appointments returns historical relationships. Companies House doesn't auto-resign a director when a company enters insolvency — check company_status on each appointment, not just resigned_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

HMLR, The Gazette, and the sanctions lists require no credentials.

Project structure

Code

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
├── 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