Arlet

Connect UK Companies House to ChatGPT

Query UK Companies House directly from ChatGPT. Arlet links the two through one MCP connection and takes care of API keys.

Enable UK Companies House in ArletChatGPT connection guide (docs)

Connects your AI client to the Companies House Public Data API (api.company-information.service.gov.uk), the official register of companies in England, Wales, Scotland and Northern Ireland.

Tools (all read-only):

  • search_companies: search the register by name or number and get company numbers, status, type, incorporation date and registered address.
  • get_company_profile: full profile of one company (status, type, SIC codes, accounts and confirmation statement due dates, registered office, previous names).
  • list_officers: current and resigned directors and secretaries with role, appointment/resignation dates, nationality and occupation.
  • list_filing_history: filings (accounts, confirmation statements, officer changes, charges, resolutions ...) with an optional category filter.
  • list_persons_with_significant_control: PSC register entries (individuals, corporate entities, legal persons) with their natures of control.

Authentication: HTTP Basic with your own API key (free registration at the Companies House Developer Hub; 600 requests per 5 minutes per key).

Licence: Companies House data is Crown copyright and reusable under the Open Government Licence v3.0. Each response carries the source and licence.

How to connect UK Companies House to ChatGPT

  1. 1

    In the Arlet dashboard, open Data tools, find UK Companies House, set the API key issued by UK Companies House and switch it on.

  2. 2

    In ChatGPT, open Settings → Plugins → Browse plugins and click + at the top right.

  3. 3

    In the New Plugin form, enter "Arlet" as the Name, choose Server URL for Connection and enter https://mcp.arlet.dev/mcp/, pick OAuth for Authentication, check the risk acknowledgement and click Create.

  4. 4

    Open the Arlet plugin you created, click Sign in with Arlet, sign in with Google and click Allow. The connection is complete.

If the Plugins screen is not shown, turn on Developer mode under Settings → Security and login.

Use UK Companies House with other AI clients