Links with information about voting that you may find useful:
Register to vote here: https://www.gov.uk/register-to-vote
Postal Vote application form: https://www.gov.uk/apply-postal-vote
Proxy Vote application form: https://www.gov.uk/apply-proxy-vote
Voter Authority Certificate: https://www.gov.uk/apply-for-photo-id-voter-authority-certificate
The Electoral Commission: https://www.electoralcommission.org.uk/i-am-a/voter