About the data

Open, queryable data on money and influence in UK politics.

Two separate registers

OpenInterests draws on two distinct public registers. They have different rules, thresholds and purposes, and a member's page shows them in separate sections — so it is worth knowing which is which:

Financial interests

The House of Commons Register of Members' Financial Interests (RMFI) — what each MP self-declares: employment and earnings, gifts, overseas visits, property, shareholdings, and donations and other support. It covers sitting MPs; the House of Lords keeps a separate register (a planned addition), and the structured feed is a snapshot of the current parliament, so former members show no interests here rather than none ever held.

Donations

The Electoral Commission register of regulated political donations — money given to parties, members and other regulated recipients. Because a large donation to an MP can be reportable to both bodies, the same gift may appear under both a member's interests and their donations received.

Around half of all registered interests — overseas visits, shareholdings, unpaid directorships and the like — carry no monetary value, so any “value declared” total reflects only the interests that do.

Using the JSON

Entity pages serve HTML at their URL and JSON at the same URL with a .json suffix. A member's interests and a donor's donations are embedded in the entity JSON.

The listing pages (/members, /donors, /donations, /interests) are HTML only, and are paginated (?page=) and filterable (e.g. /members?house=lords&is_current_member=true).

Coverage

Current MPs

652

Current Lords

791

Former members

3737

Registered interests

4112

Donations

91633

Organisations

9256

Sources & licensing