If Kez is going to post information (even though it's too late to help the questioner anyway) it might as well be correct!
If an item fails to function properly due to an 'inherent fault' (which was there at the time of sale, such as the use of poor quality components or poor workmanship) the retailer is obliged to REPAIR or REPLACE it if that fault occurs within 6 YEARS of purchase. For the first 6 MONTHS after purchase there is an automatic assumption (unless there's clear evidence to the contrary) that any problem must be due to an inherent fault. Thereafter it's up to the purchaser to show that it is the most likely cause.
Even that information, however, isn't actually relevant to the original question! A purchaser is not deemed to have 'accepted' a purchase until a reasonable time has elapsed for him/her to check that it is functioning properly. Kevo2K7 found that the item was faulty before legally 'accepting' it and so (under completely different legislation to that referred to above) retained the right to a FULL REFUND (and not just to a repair or replacement).
Chris