These shows are over, sadly, but most of them are better than 95% of current programming.

4400

Arrested Developement

Babylon 5

Brak Show

Carnivale

Da Ali G Show

Deadwood

Extras

Farscape

Firefly

Flash Gordon

Dresden Files

Frasier

Seinfield

Futurerama

Hex

Jekyll

Jericho

John from Cincinnati

Malcom in the Middle

Moonlight

Mr. Show

The Office UK

Oz

Rob & Big

Rome

Sopranoes

Spaced

SG-1

Summer Heights High

The US is where the money is, but British shows can be just as entertaining. Here is a list of all the British shows I have seen so far

Peep Show

Spaced

The Office

Mighty Boosh

Doctor Who (New)

Doctor Who (Old)

Torchwood

Robin Hood

Jekyll

Hex

IT Crowd

Red Dwarf

Extras

Hustle

Black Adder

Primeval

Black Books

Mock the Week

The Last Train

Eventual Shows: Ultimate Force, Hotel Babylon, Coupling, Jonathon Creek, Life on Mars, Spooks, Secret Diary of a Call Girl, Wire in the Blood, Moving Wallpaper, Nevermind the Buzzcocks, The Fixer, 5 Days, Kingdom, Lewis, Shameless, Wateloo Road, The Catherine Tate Show, Bad Girls,