The customer's contract is with the retailer, end of story. That is the law. Manufacturers may well offer a guarantee and may well offer to repair the appliance, and shops will often use this as an excuse to get out of their obligations, but that does not change the law. That is why they all say somewhere in their policies that "this does not affect your statutory rights".
If you just want a repair, fine, go through the manufacturer (although in this case I would argue that 2 weeks is too long to wait). If you want to exercise your legal right to a refund or replacement, then you should go through the retailer. I�ve done this myself and they do try to fob you off, but if you stand your ground, quote the sale of goods act and as a last resort threaten the small claims court, they usually start to listen. Slightly off the subject, but to prove that this works, I�ve just had a replacement of a 2 year old, out of warranty, DVD recorder by doing just this.