Phone the shop and explain the situation, they may be able to help.
Phone the shop and explain the situation, they are legally obliged to help.
As others have said, your contract of sale is with the retailer, not the manufacturer. Under the Sale of Goods Act they’re obliged to rectify any faults; outside of six months the onus is on you to prove that the fault was inherent at the time of purchase but, if as you say they’re clearly stitched incorrectly, that shouldn’t be difficult in this case.
If they need to go back to Endura for repair / replacement then fine, but that’s the shop’s problem. The shop might be 200 miles away but you can post goods to foreign countries and everything these days.