You have to invoke the Sale of Goods Act 1979 Part II Section 14, as modified by the Supply of Goods and Services Act 1982, subsequently modified by the Sale and Supply of Goods Act 1994, contending that the supplier is in breach of contract to you for supplying a car which was not "of satisfactory quality", or did not remain so for a reasonable period of time. Appeal Court Case law (Bernstein v Palmerston Motors 1987) has held that the supplier must be given three chances to rectify the fault for which the goods are rejected and must have failed to do so. The goods must be returned to the supplier together with all keys and paperwork. (Scott and Scott v Blade Motor Company 1997.) And the supplier (in the case of a car the dealer principal of the dealership) must be sent a letter by recorded delivery detailing why the car has been rejected as not "of satisfactory quality". Case law (Rogers v Parrish 1987) has put a limit of 6 months on the time you can successfully reject a car and obtain a full refund, though lesser refunds, taking account of mileage covered, may be obtained outside that period. The price you pay compared to market value will be taken into account. So if you buy a cheap car on trade terms you cannot reject it under the Act. And if you buy a cheap car (under £2,000) on retail terms from a trader, you cannot reasonably expect it to be perfect
After 6 Months
Under sale of goods legislation (Sale of Goods Act 1979, Sale and Supply of Goods Act 1994) consumers are entitled to expect that any goods they buy are of satisfactory quality. That is, that the goods meet the standard that a reasonable person would regard as satisfactory taking into account the way they are described, their price, and any other relevant circumstances, such as the fact that they are second-hand or used. ... ..
If a product that was not of satisfactory quality at the time of the sale is returned to the retailer, the buyer is entitled to a full refund (if it is within a reasonable time of the sale), or, if a “reasonable time “ has elapsed, to a reasonable amount of compensation, or to have the goods repaired. The consumer needs to demonstrate the goods were not of satisfactory quality at the time of sale. This is so if the consumer chooses to request an immediate refund or compensation. It is also the case for any product returned more than six months after the date of sale.
If the amount is less than £5,000 and qualifies for the Small Claims Court then any decision made does not become case law.
However, if it goes to the County Court, then a decision does become case law. County Court rulings can be overruled by Appeal Court rulings which then become case law. And cases will be argued on the facts. So though the Sale and Supply of Goods Act may appear to give you rights, your true rights are governed by case law and asserting them can be very expensive.
PS, I do have to agree with jaffa,this fiasco should've been adressed months ago,however I wish you well with your claim.
Ride safe if poss