So... UK only, huh....
As predicted, the BBC has added their television programs to iTunes UK. Accessible through UK iTunes:
BBC Worldwide brings iTunes users in the UK the best of British TV programmes from the BBC. Our programmes are exciting, compelling, passionate, provocative, bold, unpredictable and moving, and include some of the best comedy -- Little Britain, The Catherine Tate Show and Two Pints of Lager & a Packet of Crisps -- and a fantastic selection of contemporary drama, including Torchwood, Spooks and Life on Mars, all available to download now. New titles will be added regularly, including top-quality documentary series and brand-new drama and comedy
Shows are priced at £1.89 per episode and are still being added to. Apple's UK Hot news also list Robin Hood and Ashes to Ashes amongst the available shows. They also specify that the newest episodes will be available for for purchase and download eight days after they are screened on TV.