You don't need to complain in a "complaining" way, iyswim.
The shoes are clearly "not fit for the purpose for which they're intended". Just smile and be pleasant and at no point say "sorry". Say something like "I'd like a refund please" and then go on to show/explain.
£50 shoes falling apart after 3 weeks? That's appalling.
www.consumerdirect.gov.uk Remember, if you are entitled to a refund, replacement, repair or compensation, it is the trader who must sort out your problem. The trader cannot tell you to go back to the manufacturer.
Huw - I did say that to DH! He aparntly is fat too busy even though his office is a feww doors down from the shop. He says it will be better coming from me as I spend aslmost as much as we do on our mortgage in there (slight exageration).
I pretty sure she will tell me to take them to the cobblers, and she will pay the bill. ( I think the cobblers could probaby ment them) Is this acceptable? Obviously, I'd rather just have a new pair but if I asked for a new pair she'd probably pretend she didn't have any in his size.
TBH when all the new stock comes in I expect there will be models which are faulty.
I now buy a cheap pair for dds, for the first few weeks back to school and then buy them something later when the cheap pair have fallen apart. That normally means I only buy one expensive pair in Nov - Dec, to get them through to spring, then another cheap pair if their feet have grown in the spring sales to get them through to summer.