Posting this as I had previously bought this TV from Richer sounds, but then saw an offer at coop electrical, which Richer Sounds beat retrospectively by £20. Huge drop from the launch price of £2k not too long ago.
Had this set for nearly a week now and it's incredible. Chose it because it's 4k, full 10 bit HDR, android platform, playstation now, 3d option, build in google cast, and mainly, it gets excellent reviews (5 stars from what hifi and AV forums).
They have also employed a clever LED backlighting system using 2 LED light modules & 2 light guides making it comparable to a Full Array LED backlight TV.
Coop electrical have the set for £1,299 but code CPTV100 bring it down to £1,199. Just call your local RS and they will beat the price by £20 quid (and give the free 6 yewar guarantee) as advertised on their website.
Hope this helps somebody, from what I can see this is the cheapest and best way to get this TV. I can't recommend this set highly enough.
Link to whathifi review...http://www.whathifi.com/sony/kd-55xd9305/review