Cheapest i can find at £699 , also 12 months BNPL + a free Very Treat but see below to get it even cheaper !
New customers: can get 10% off ( Enter code 4JLNY at the checkout before 31st January 2015) and 7% top cashback , sign up and use code in one transaction do not log out of site once you click through from cashback site
Existing customers: Heres a 10% off tip that may work, if you have an account log in add an item to your basket take it through the checkout right up to payment screen then close your browser, they will then email you a 10% off code, worked on 4 accounts i have (Isme/Very etc)
The 10% code they sent me was 4JNH6 comes in at £636.05 delivered
+ Possible FREE multiroom hub http://www.samsung.com/uk/offer/multiroom
(thanks ministrymason) says instore but worth trying