We have a basic REST API. You can get information available here in different formats by changing the file extension on URLs.
Sitting days
The default HTML rendering of a page: https://api.parliament.uk/historic-hansard/sittings/2002/apr/16
OPML output for that page: https://api.parliament.uk/historic-hansard/sittings/2002/apr/16.opml
JSON output for that page: https://api.parliament.uk/historic-hansard/sittings/2002/apr/16.js
Constituencies
Add .js to a constituency URL to get JSON output.
People
Add .js to a person URL to get JSON output.
Memberships
The default HTML list of members of each House on a given day: https://api.parliament.uk/historic-hansard/all-members/2002/apr/16
JSON output for that page: https://api.parliament.uk/historic-hansard/all-members/2002/apr/16.js