There's lots of very valuable info to be found on here, but Internet TV is a fast developing area - new gizmos and widgets are being launched and updated almost daily, and some of these new developments are particularly well suited to the Expat looking for a cost effective solution to getting their fix of UK television.
To stay on top of these developments, get reviews on what's new, and how well suited they are to Expat users, I can thoroughly recommend you add this website to your Favorites...
http://www.eyeondemand.com
The site is run by an experienced British IT technician who is now based in Germany, so the advice is always sound - and if the stuff he suggests works for him there, then the chances are pretty good that they will work for you here.
Just bumping this up top, as it's still one of the best resources on the web for folks wanting info on the available UK TV options.