Well, went for the 48" H5500. Glad I didn't get the 50", as it wouldn't have fitted in my car. Got it from Richer Sounds -- called them, they had one, and I drove over and collected. Very simple, though the general manager of the shop was a massive bellend.
TV is great. Very bright, the smart interface isn't cripplingly slow, and the ability to 'send' youtube videos to the TV from your phone works much better than anticipated. Plays very nicely with the Raspberry Pi too.