Or you can actually use something like vpntunnel.co.uk. This gives you a full and valid UK IP address (no dodgy proxy servers needed)

It works pretty good, you get a bandwidth limit (or 50 gig so - loads of tv streaming) and this for £10 / month

I use it mainly for streaming while working on my computer. It works for iPlayer, ITV Player, C4 Catchup and basically everything that works in the UK.
(including Radio streaming like Radio 5 live)

Even Zattoo detects you to be in the UK now, which gives you the uk selection.

The set-up is easy - their website lead you through each step needed.