Your first port of call should be the retailer or supplier. The Sales of Goods Act 1979 (and amended in 1994), and the Sale and Supply of Goods to Consumers Regulations 2002 apply here. Basically a combination of UK and EU regulations state that if an "inherent" fault in any electrical equipment occurs, the consumer has from six years from the date of sale to report the fault to the supplier in order to get a) a full refund, b) a reasonable amount of compensation (or "damages"), or c) a repair or replacement. It's down to the consumer to prove the "inherent" fault if it occurs after the first six months, but I personnally think it's reasonable to expect a TV to work for longer than 2.5 years - therefore, logically, the fault must be "inherent" ie. was present at the point of sale. The DTI website has further information on these matters, as does the Watch Dog website.