UK Due Diligence

Tools across five UK public registers. Zero paywalls. All official APIs.

Give an agent a company name and it pulls corporate status, filing compliance, director networks, beneficial ownership chains, disqualification checks, insolvency notices, VAT validation, and property transactions.

Every data source is a legally-mandated register with a free official API.

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Data Sources

Register	API	Auth
Companies House	api.company-information.service.gov.uk	API key (free)
Charity Commission	api.charitycommission.gov.uk	API key (free)
HMLR Land Registry	landregistry.data.gov.uk (SPARQL + REST)	None
The Gazette	thegazette.co.uk/all-notices (Linked Data)	None
HMRC VAT	api.service.hmrc.gov.uk	None

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Tools

Tool	Register	Description
company_search	Companies House	Search by name/keyword with status/type filters
company_profile	Companies House	Full profile: status, filing compliance, charges
company_officers	Companies House	Directors with high-appointment-count risk flag
company_psc	Companies House	Beneficial owners, PSC chain, offshore flags
disqualified_search	Companies House	Search disqualified directors by name
disqualified_profile	Companies House	Full disqualification record, period, Act, companies
charity_search	Charity Commission	Search by name, filter by registration status
charity_profile	Charity Commission	Full record: trustees, finances, governing doc
land_title_search	HMLR	Property ownership via SPARQL PPI query
gazette_insolvency	The Gazette	Corporate insolvency notices (codes 2441-2460)
gazette_notice	The Gazette	Full legal wording of a specific insolvency notice
vat_validate	HMRC VAT	Trading name + address as registered for VAT
search	All registers	Fan-out search across all registers — returns IDs for ChatGPT deep research
fetch	All registers	Fetch a structured record by ID returned from search

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Prompts

Three workflow prompts orchestrate multi-step investigations. Available via get_prompt on tool-only clients (ChatGPT) and natively on protocol-aware clients (Claude, Inspector).

Prompt	Description
due_diligence	Full DD check — company, officers, PSC, gazette, disqualification
charity_due_diligence	Charity profile + insolvency check
director_check	Disqualification status check for an individual

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Connect

Hosted (no install)

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

Local (uvx)

export CH_API_KEY=your_key
export CHARITY_API_KEY=your_key

{
  "mcpServers": {
    "uk-due-diligence": {
      "type": "stdio",
      "command": "uvx",
      "args": ["uk-due-diligence-mcp"]
    }
  }
}

API Keys

Key	Where to get it
CH_API_KEY	developer.company-information.service.gov.uk — free
CHARITY_API_KEY	api-portal.charitycommission.gov.uk — free

HMLR, Gazette, and HMRC VAT require no API key.

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Demo

Run due diligence on Carillion PLC

The agent calls company_search to resolve the company number, then company_profile, company_officers, company_psc, and gazette_insolvency — reasoning across all five registries to surface risk signals.

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Project Structure

uk-due-diligence-mcp/
├── server.py           # FastMCP init, tool registration, transport config
├── companies_house.py  # company_search, company_profile, company_officers, company_psc
├── disqualified.py     # disqualified_search, disqualified_profile
├── charity.py          # charity_search, charity_profile
├── land_registry.py    # land_title_search (SPARQL + REST)
├── gazette.py          # gazette_insolvency (JSON-LD, notice codes 2441-2460)
├── hmrc_vat.py         # vat_validate
├── http_client.py      # Shared httpx clients, retry backoff, error formatting
├── inputs.py           # Pydantic v2 input models
├── fly.toml
├── Dockerfile
├── pyproject.toml
└── .env.example

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Technical Notes

The Gazette API

REST+RDF linked-data pattern. Corporate insolvency notice codes span 2441-2460. The read API is unauthenticated; auth is write-only (for placing notices).

HMLR Land Registry

Free endpoint at api.landregistry.data.gov.uk. Returns RDF/Turtle by default — the SPARQL endpoint is used for Price Paid Index queries. Covers England and Wales only.

High-Appointment-Count Signal

Directors with 10+ other active appointments are flagged. A director on 40+ companies is a common pattern in nominee director operations and phoenix company structures.

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Licence

MIT