I think it was the 'Remote Controller' - the alias for the tv critic of Private Eye magazine, - who said one of the issues that Dead Ringers had, was most sketches where the impressionist directly addressed the camera/viewer all to often started with "Hello I'm ..." or "Good Evening, ..... here" telling you who it was, as if the make-up and the impression wasn't good enough to give a hint for the viewers.
A bit like the Jeremy Corbyn impression on the recent Tracey Ullman series. Make-up/prosthetics absolutely brilliant. Impression, absolutely awful. Since when did Corbyn have a voice and accent like a 1950's gravel voiced east end docker? It was almost a case of "ignore the voice, the make-up will get the sketch past the viewers"
Same with a lot of Dead Ringers tv sketches.
My user name might look like Hatton Cross, but it's pronounced Throatwobbler Mangrove.
London Lite and DE88 gave kudos