The shops talking utter rubbish, in refusing to deal with the problem. They are responsible in the first twelve months, for dealing with any faulty items that they sell under the terms of consumer laws, not the manufacturer. Having stated that, the manufacturer may provide a additional warranty, usually up to 3 years as a 'swop-out' agreement. This normally means that you contact the manufacturers call centre (on warranty card), who will then make arrangements for a replacement, as per their terms and conditions.
The replacement should be 'equivalent to, or better than' the model being replace, if an exact model is not available. This may also mean, that the substituted model could be a refurbished unit, and not brand new. The remaining warranty should still be intact, upto the 3 year cover. It would be upto you, whether you contact the manufacturer in the first twelve months, but by contacting the manufacturer, may avoid unnecessary delays, as the seller would have to follow the same route, in obtaining a replacement perhaps, unless they supplied new from their own stock.
Trading Standards click here