Ok, will keep this brief. Bought a top at Sainsburys, was too small but couldn't find receipt.
Rang ahead to say I would like to exchange it, still had all tags etc but I couldn't find my receipt anywhere and they have said they won't exchange without it.
I explained that I didn't want a refund just the bigger size but they said it's a no go. I know they're not legally obliged but I am stunned a retailer of this size won't help.
As an alternative I could damage it, say it was faulty and get a full refund! That's not my style at all but I am astonished they are virtually encouraging this behaviour rather than having a perfectly acceptable item they could sell on!