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Thanks for your replies. What he really wants is to have had an immediate replacement!
He has already sent them a photo, and they agreed that it is faulty. However they have offered no apology, and just keep blaming the supplier, slumberland for the delay.
They said that they had asked slumberland to throw in a couple of pillows as a goodwill gesture, but they refused. Surely though the contract is with the shop and it is up to them to offer any such gestures?
He would really to prefer to have it replaced bedknobs, as obviously if he gets a refund he will be left with nothing to sleep on until he orders elsewhere.
Would he be within his rights to demand an interim mattress immediately, until they sort out a replacement?