Someone's no doubt referenced it upthread, but it's a proper joy seeing Gavin & Stacy from the start again.
Other stuff:
Life and Loves of a She Devil (Britbox) - of its time (mid 80s) and horrifically dated now, but super camp fun
BrainDead (Amazon Prime) - entirely willing to believe this is exactly what's going on, frankly
The original series of 'Survivors' (i.e. "it could be worse") - you'll have to hop around several places if you want to see the whole three series of 1975-1978 The Apocalypse Good Life, but the first few of Series 1 are on YouTube, and a few more are on Vimeo