Proxy must be in your constituency. When I lived overseas, I voted by proxy but first needed to remember where I was last on the electoral roll. My cousin drove from Arnold to Basford to cast my vote.
In my Conservative constituency, lots of stuff through the door from the Lib Dems. Nothing from Labour. I think there was something Conservative but it went in the bin so fast I'll never be sure. Looks like Labour have given up to allow the Lib Dems to take the second safest Tory seat in Wales.