Who does the perfect English accent? I have in mind: Desmond LLewelyn who played Q in the James Bond films. John Nettleton who played Sir Arnold Robinson in Yes Minister. Patrick Malahide playing the upper crust character who says, "Top hole" in The Singing Detective - a series that exemplified what a versatile actor he is. Jennifer Dickson Wright , the remaining one of the two fat ladies.
Noel Coward ? https://www.youtube.com/watch?v=qZ1niLkPaOo&feature=related"]"I Like America" By Noël Coward - YouTube
I'd suggest Brian Sewell https://www.youtube.com/watch?v=u3G618-hxgA"]Last of the Medici - Brian Sewell
https://www.youtube.com/watch?v=JSruSe_m8OI"]A Matter Of Life And Death - Opening Sequence - YouTube DAVID NIVEN or, possibly, peter cushing https://www.youtube.com/watch?v=r1ZaxtrABws"]Dracula Revealed - YouTube