Candidates are announced to day. Your local paper should have them. To contact by email (why wait to see if they canvas) you might need to use the generic email for the local party group and just put for candidate (name of candidate) in the subject.
If you are worried about your real name or email address being used by the unsympathetic, then get a free email under a slightly different name - your maiden name or middle name perhaps. You can make something up entirely but if I am asked is this really you I'd like to say yes with a straight face - as it is an election.
You can get a free encrypted email from Proton - very easy to set up and use. There is a paid version which you can pay anonymously apparently and get several aliases if want to keep work, politics and other stuff separate.
protonmail.com/signup
A email template is here if you don't know where to start:
women-uniting.co.uk/2022/04/03/respect-my-sex-candidate-email-inspiration/
We're on a roll with what Boris said today - let's make sure all parties, their candidates and local workers know we've had enough and want some straight answers about our status and security.