BRM, before you start suggesting that I should invest in information, I asked where in law it says that the retailer assumes responsibility for all warranties. You haven't shown me that.http://www.which.co.uk/consumer-rights/ ... -goods-act
There's a summary for you, knock yourself out.
Your rights are against the retailer – the company that sold you the product – not the manufacturer, and so you must make any claim against the retailer.
Any warranty the manufacturer advertises or provides simply means that the retailer can get their money back (eventually) when the retailer has sorted your warranty goods out. A manufacturer denying you a warranty claim is simply their expert* telling the retailer that the failure is not due to faulty goods, its either wear and tear or misuse. So they advise the retailer to reject the customers warranty claim, as the manufacturer (or importer) won't reimburse the retailer.
Some bigger retailers (with more cash) may simply honour the warranty anyway, as it makes them look good. Same with some manufacturers experts*, they may advise that they will cover the replacement goods. As it costs them bugger all in the grand scheme of things.
*I say "experts" with my tongue firmly in cheek, as most of them are simply following a checklist, or have a series of guidelines as to what is ok and what isn't. This usually doesn't cause any problems as the customer has even less "expertise" than the person on the other end of the phone.
If you want to push a bit harder with a rejected warranty, you need to read and understand the SOGA and get your own expert.