This seems like a great deal for a 65 4K LED TV with 5 year guaranted!
Current price is £1539 so if you use the £100 off code which then takes the price to £1469.
£100 Off Code: 100TV
Quidco is offering £75 for all TVs 50* so then after Quidco and £100 off code, it brings down you to £1364 which is a decent price overall for this TV.
There are other cheaper offers available but you won't get much cashback there!