'isn't it?' is pretty much a national thing'is it?', AFAIK, is specifically a Welsh thing.
(
lord bofingham,
Sun 8 Jan 2012, 15:51,
archived)
and the word "kift"
SkUG >_O i got a couple of stitches in my eyeball... ow,
Sun 8 Jan 2012, 23:41,
archived)