Baggist

Apologies if this has been discussed elsewhere but finally there has been victory in the long campaign to end the 15-year rule and allow UK expats to vote in general elections.
In time for the 2024 GE.

https://www.theguardian.com/politics/2024/jan/16/britons-living-abroad-regain-right-to-vote-in-uk-elections-as-15-year-rule-ends

https://www.britishineurope.org/articles/136295-bie-seasonal-greetings-getting-ready-to-vote-blog-2-faqs

Prevail Dias

You can register as an overseas voter if you're either: a British citizen; an eligible Irish citizen registering to vote in Northern Ireland.