hang on - she bought it 6 months a go and has done 1000 Miles - then its the dealers responsibility - your complaint is with them, first. The warranty is an added extra - not a replacement - they cannot shirk their legal responsibility - have a look at
this - and similar. Sounds like a good case for trading standards

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I draw your attention to the following....
"If you have a problem with a secondhand vehicle you have bought from a dealer, first work out what rights you have and decide what you want the seller to do about it. It is the dealer and not the manufacturer who is responsible for dealing with your complaint."
"If the vehicle came with a guarantee or warranty, you might find it easier to claim on this if the dealer is refusing to give you what you want. Guarantees and warranties can also be very useful if the dealer has gone out of business.
It can also be more convenient for you to make a claim on a guarantee or warranty "
"
You may have bought an extended warranty with the vehicle. This is an insurance policy and is a separate contract between you and an insurance company. However, an extended warranty cannot take away your rights to make a claim against the dealer."
If the car was sold with a guarantee or an extended warranty, you may have
additional rights. The guarantee or warranty cannot take away your statutory
rights. You should check the small print on your warranty. Many have exclusions
such as wear and tear.
If the car is faulty and you have left it too late to claim a refund or you don't
want one, you can ask the dealer to replace or repair it free of charge. If you
do this within six months of receiving the car, and it is reasonable to expect it
to have lasted for the period of time you have had it, it will be assumed that
the problem existed when you bought the car, unless the dealer can show
otherwise. However, you can still ask for a replacement or a repair for up to
six years from the date that you bought the car, if it is reasonable for it to have
lasted that long. In this case, it will be up to you to show that the car was
faulty at the time of sale. The longer you have had the car, the more difficult it
is to prove that the fault was there at the time of sale.