Spitting Image Does Postman Pat

Not the Nine O'Clock News Does That's Life

French and Saunders Does House of Elliott

https://www.youtube.com/watch?feature=player_detailpage&v=lmdvibpgQKc (for some reason I can't embed this sketch)

Kenny Everett - Ask The Family

Tim Brooke-Taylor (The Goodies) does Heinz Baked Beans Advert

The Two Ronnies do Colditz

Victoria Wood-Vintage Corrie

Apparently I can't find a version that doesn't start with that 'comedy classics' bit at the start

Morecambe and Wise Do Man From U.N.C.L.E.