In previous elections and the referendum many postal votes went astray, or just did not arrive in time. Or were rejected by the automatic signature scanning equipment. It is far better and safer to set up with someone to vote in person for you. Known as a Proxy Voter.
Some people overseas no longer have trusted connections who can get to their UK polling station for them.
So an organisation has been set up, mainly on Facebook but available via other ways, to link up willing Remain proxy voters and people who need them.
See this article www.independent.co.uk/news/uk/politics/general-election-remain-proxy-voting-remain-expats-tactical-a9204416.html
Or just join www.facebook.com/groups/RemainProxyVoters/
The people are linked up but it is their own final choice to go through with the partnership. The voters all have to be vouched for.
Remainers overseas, please spread this through your networks,