[gigi]

I didn't know he was British, he does a great job covering it up.

[TonyWpi]

He played a Brit henchman in the live version of 101 Dalmations with Glenn Close as Cruela DeVille.

[b9]

'?-?n't know he was British, he does a great job covering it up.

So do lots of other actors, like the black lady detective
on Without a Trace, and Cary Elwes (Princess Bride.)
Also that guy on "24"...the husband who got shot?
He totally lost his British accent for "Where the Heart Is" with Natalie Portman.

There must be lots more...Aussies, too.