Firstly, Sky is rejigging its EPG in a (futile) attempt to compete with TiVo. Not coming until the end of the year (and even then it won't be on all boxes). More details at http://crave.cnet.co.uk/televisions/sky-gets-new-look-planner-and-tv-guide-50008175/
Meanwhile, LoveFilm has finally added HD to its (frankly pretty poor quality) UK streaming service. This news from Crave;
If you're watching on an Xbox, Blu-ray player or smart telly, you'll get a 720p stream. Only some titles are currently available in HD -- on its blog Lovefilm explains that flicks like Apocalypse Now and Attack the Block* will be streaming in glorious high definiton, as will TV shows including Planet Earth and Lost.I would personally recommend Apple TV over Netflix or LoveFilm from a picture quality perspective, but it's not anywhere near as cheap.
Unfortunately Lovefilm says it doesn't have studio rights to stream HD on the iPad, while PlayStation 3 owners are also left out -- though Sony's console currently streams in higher than standard quality apparently, as do Sony tellies and Blu-ray players.
* Incidentally, Attack the Block is on 4HD this Sunday evening - a fine Brit flick from Mr Joe Cornish!