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That's what concerns me, Bobbisox1, they weren't cheap & would obviously be useless to anyone else.
It's been longer than 14 days but they told me I had 28 days to change them for something else, including separate pairs where a 2nd pair would be half price (& would still cheaper than what I've already paid). I s'pose giving that option infers they're prepared to lose some of what I've paid.
They're not one of the recognisable shops, I'd never heard of them, but they do have other branches.
Well, consensus seems to be to get a refund, thanks. The manager's SO persuasive tho' ...