SeeSaw.com

A free and legal online TV service where you can watch broadcast-quality programmes on the web. Catch up on programmes you've missed for up to 30 days or rediscover old favourites. You can choose from comedy, drama, lifestyle shows, factual programmes, sport and much more. If it's available you can even watch whole a series.
The programmes are those that have been shown on the UK TV channels - BBC, Five and Channel 4.