There are many other sources of information about registering to vote overseas. We simply list these here – some of these sites are not neutral!
UK Gov – Voting when you’re abroad
Electoral Commission – Overseas voters
Some local councils have information about registering, and deadlines – Epsom & Ewell Borough Council has a clear and comprehensive list, for example. Meanwhile Bristol Council has a PDF explaining how to apply to cast a Proxy Vote by post (if your proxy voter doesn’t live in your constituency).