Sony Centre have just released a load of new refurb TVs.
65XH9005 - £679
65XH9296* - £679
55XH9505 - £699
49XH9505 - £579
55XH9005 - £529
55XH9296* - £529
Also plenty of the XH9*** series TVs and OLEDs.
*9296 & 9005 are essentially the same TV, but the 9296 has movable feet.
You should be able to phone up your local Sony centre following delivery to buy an extended warranty.
These are normally in pretty much new condition, and they will fly out at these prices (so be quick)