I googled Rolf Harris yesterday. Turns out his parents are from Cardiff, and he left Australia at 22 and has lived in the UK ever since. A Welshman masquerading as an Australian.
He is not on my 'Best Welsh People' list, but in the interests of fairness I thought we should collectively generate one from the Dis Hive Mind.
So far I have, Future of the left (Band) and David Temnant (Actor, Former Time Lord)