I never had any favourites as we didn't have a tv, but I used to love Magic Roundabout, Bagpuss, Mr Benn with my children.
Slightly off topic - We had a compilation video of Bill and Ben, Muffin the Mule, Andy Pandy etc, and I put it on for my very young nephews a few years ago. They came running out to tell me my tv was broken (they had never seen black and white)