Heard of this on Torchwood in Ghost Machine (S1Ep3)
Jack: This kid, Bernie. Where does he live?
Tosh: Splott.
Owen: Splott?!
Ianto: I believe estate agents pronounce it "Sploe".
And on a Torchwood fan-fiction, Ianto Jones' Diary:
Note to self: with this group, never tell a joke that requires...