In reply to A Longleat Boulderer:
I'm surprised they'll refund it as it's PPE, In the place I worked there was a strict no return on PPE policy, everything from climbing gear to bike helmets.
And their website t+c section says "Note: DVDs, videos, books, safety equipment, ropes and snowchains are non-exchangeable and non-returnable"
I suppose it depends on what it was shipped it, if it was shipped in a sealed package they could see be sure that the harness hasn't been tampered with.