One question we are asked frequently is where can people download lists of contact details for MPs and Peers.
There is a publicly-available list of MPs and their basic contact details on the UK Parliament website here: https://www.parliament.uk/site-information/freedom-of-information/information-we-already-publish/house-of-commons-publication-scheme/members-and-members-staff/parliamentary-contact-details-for-mps/ This list is updated every three months.
It is also possible to view and download up-to-date comprehensive contact details for MPs and Peers from Dods People, accessible via the House of Commons Library. Please note that this is only available to those who have a parliamentary network account and is not in the free public domain. https://commonslibrary.koha-ptfs.co.uk/cgi-bin/koha/opac-detail.pl?biblionumber=185072
There is an A-Z list of all of the resources available from the House of Commons library here.