Ah, I think you misunderstand, Dana. I have a great respect for the extremely talented Mr V Dyke.

However, in the UK, his performance in Mary Poppins is cited as history's worst ever attempt at a british accent by a foreigner.
(At best he comes across as a drunken gay australian with a cleft palette.)

Whereas Mr Depp is as close to native as I've ever heard from an american.