Hopefully this won't be too hard once solvers catch on to the theme.
Warning: regional accents may vary. All of these clues work with Standard English pronunciation so please don't tell me how they are pronounced in Northumberland or wherever.

PS. Should work for Americans too, apart from "porn" maybe.

Excellent concept - took a minute to figure out the theme, then the groups came quickly. Clever!

I enjoyed this one. As you say, once you recognise the common theme the clues fall into place quite quickly. Still, a great concept and good fun. Thanks!

Lovely stuff, well done.

Knot the wurst

@Mister Tom: Grassy arse.

Far too clever for me! Satisfying answers

Great fun. Thank you

alms and porn are most definitely not homophones of arms and pawn. looks like you don't pronounce rs at all......

good quiz, last group a little spurios