The point is, igrf, that the OP shouldn’t even need to know who you are. Warranties are useful as they can sometimes give consumers rights over and above their legal rights. In this case, statements like this:
We’d normally assist the dealer with a goodwill gesture…
The procedure will be photo’s, purchase evidence that it is UK sourced and a return no issued to the dealer if, the dealer feels it is a warrantable fault.
suggest that between the shop, you and whoever else in the supply chain, he’s being palmed off without getting what he’s entitled to. I personally would advise him not to engage with anyone other than the shop as that’s who he has the most effective legal relationship with.
my suggestion would be to write a letter giving the shop 14 days to provide either a replacement for the faulty parts or a full refund, and leave the bike with the shop. no doubt the supplier/distributor/whoever would then have to reimburse the shop for the faulty item, but that’s really none of the OP’s concern due to the time involved.