Following on from rumours that came to light earlier today, it appears that BBC Worldwide content has begun to appear (iTunes Link) on the UK iTunes Store.
As of writing the content is only available in the UK.
The following shows are now available from the BBC on the UK iTunes Store; Torchwood, Spooks, The Mighty Boosh, Life on Mars, The Catherine Tate Show, Spooks, Two Pints of Lager and a Packet of Crisps and Little Britain.