My current favorites are "Red Dwarf" for its sci fi content and its star's wonderful Scottish accent

Red Dwarf is great fun, but I thought I'd point out that there is no Scottish accent in it.

Rimmer - poncy RP
Cat - poncy
Krytten - American/Welsh
Holly - RP-esque

and the great Lister - Brummie (from Birmingham), or 'Black Country', at a stretch - and yes, he's right, we're all smegheads!

Come on you Brits - correct me on this if I've mucked it up.