Malcolm started in 4:3 - I remember reading somewhere perhaps DS that Sky used to/did broadcast it in the wrong ratio for a while, also something to do with the opening titles which were changed for UK broadcasting because of the content - not sure/cannot remember what it was. The opening titles did stay the same throughout which means it had to be stretched later on
Sky has played it from the start to the end at least 2 times since it finished and slowly moved it about , last year it must have had a final run in the afternoons about 4 or 5pm but I don't remember seeing the last series get another outing
EDIT: FIVER I think are showing it zoomed in to get a 16:9
My contribution is small but you are welcome.