The retailer probably knows the TV can diagnose what the fault is unless it was purchased from a high street chain store where the sales assistant will have no practical knowledge. It maybe worth discussing the issue with Consumer Direct.
The SOGA matches or betters the EU directive as your rights are extended to 6 years rather than 2. The onus is on the purchaser to provide an "expert's" opinion that the goods purchased are not of a merchantable quality if the warranty states it is only valid for 12 months. You can get caught in...
The 12 month warranty covers any problems within the first year. The Sale Of Goods Act can also be used to back up a claim the merchandise purchased should last longer than 14 months. The contract of sale is between you and the retailer so don't be fobbed off if they try to get you to take the...