It's not only Samsung's website that thinks your TV set doesn't exist. Google seems to of the same opinion!
However Samsung's UK support team has a good reputation, so they might be able to locate the manual and email it to you. Call 0330 726 7864 (Mon-Sat 0900-1800) to explain your problem to them. (I suggest having the serial number to hand, as it might assist them in determining how the model is listed in their database). Alternatively use this email form (again including the serial number):
http://www.samsung.com/uk/support/erms1