Hi Richard, Suggest to the windscreen company who fitted the windscreen that the part when fitted did not meet the requirements laid down by the Sale of Goods Act -- that it was not fit for purpose for which it was sold. Also tell them that should the matter be put to the small claims court It would be highly likely that a Judge would find in your favour as you have proof that it item in question was legally sold to you with a guarantee, irrespective of whose name was on the receipt. Tell them that a Judge would look at the fact that the item was fitted to the car and not to the owner of the car. It might work. Regards, Peter.