I agree with Stuartli; buy from John Lewis. They would price match the M&S price.
They also offer a free 5 years warranty & free delivery. If it was not on display, they could certainly order one in for you. Perhaps another branch, not too far from you, may have it on the shop floor.
I asked my wife about this . She reitterates if the purchase was made from M & S, then the contract was made by customer and M&S. I gather she knows what she is talking about as she is one of their most senior managers. Therefore the first point of call is at your LOCAL M&S customer services dept.
marks and spencers ?? the warranty is with themselves, but the tv is very overpriced in the 1st place. In my experience, the more being offered free - ie delivery, warranty, set up etc etc - the more money they have slapped on top of the price. EXAMPLE -