I am a lawyer. English. Check out the Sale of Goods Act 1979 as amended to date. Tell the dealer it was bought from to fix it or else. The regulations mentioned below put a whole load of extra sections in to help consumers.

Manufacturers guarantees are given effect, in part, by the Unfair COntract Terms Act 1977, and the Sale and Supply of Goods to Consumers Regulations 2003 (might be (2)) - but here the manufacturer's warranty plainly is a non-warranty so it does not help.

Get on to the local Consumer Advice Bureau or Trading Standards officers.

Hell, for the price of a Martin, go to a lawyer!