uk-due-diligence-mcp

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.

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

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`

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

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.

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.

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

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.

Licence

MIT

UK Due Diligence