Since the thread has re-opened, I'll throw my lot in!
One branch of my family (Whitty), came from Wexford to South Wales - it looks like three brothers (out of six) came here. One (my gt gt grandfather) settled in Maesteg, one moved to Slough (found about two years ago via the Whitty Clan website), and one seems to have remained in Cardiff, although all contact has been lost with them - he appears to have had daughters as they attended my gt gt grandfather funeral in the 60's, but that's literally all I know!
So in answer to a previous query on this thread, families could easily have stopped in Wales before moving onto London.
Ps, if anyone comes across Whitty births or deaths registered in Cardiff prior to 1960 (and after 1912!), feel free to let me know - I've given up at this point with my Irish lot and am concentrating on the Welsh one's
