Xmas stamps

My maternal grandfather collected stamps, not in a professional way, but more an ad hoc sort of way. The collection came to me with a promise never to give them away to charity... My grandad said most of them are worthless, but there are a few that have some collectable value. Over the years I added a small number of special stamps, but I always like the xmas ones best. As we are now in advent and with the lockdown I don't get out much, so I'm resorting to evening stamp blips...

This one is a 14p stamp from 1988 and is apparently now worth about 25p in mint condition (unlike this one).

Backblip.