U need that report to say what the fault actually is. Whether the fault was evident at time of purchase is not an issue - by their nature faults come to light after purchase, thats what guarantees and sale of goods act rights are for!
Trading Standards may be interested but this is not criminal law that they can enforce, but civil law in which they can just advise.
If you bought on finance your position is better in that the finance company have equal liability (just as if you had bought the product from them) so write to them, tell them the problem and ak them what they are going to do about it, but dont let them tell you its nowt to do with them.
Shame that solicitors are now involved on both sides of a transaction that was supposed to result in pleasure and leisure
- someone's going to have to pay them!