Hi Silverfox,
Thank you for your advise
- today I went back explained as per above that there must have been a mistake as only one pair was scanned, the lady said I could keep them!?
As it was their mistake, to which I said no I insist I pay for them.
She then scanned them, turns out the items went into a 1/2 price sale today so technically I have paid for both and they had no way to charge me the full price
I took them back to do the right thing and turns out I didn’t have to pay for them after all!
Which makes me feel even dafter!
But huge relief, lesson well learned, never to be done again.
Thank you both for your support!