| Not 100% sure if it applies, since it seems the cancellation of agreement is an act of good faith by Debenhams (assuming they inspected identical items in the showroom before agreeing to buy), but there is a time limitation for collection of rejected goods (I think it's 30 days). During this time you're required to take good care of the goods i.e. not leave them out in the garden!
I reckon this does apply since the agreement to cancel would certainly form part of the contract of sale. I can't find anything confirming that 30 day period tho... will have a look through my books and try'n find something more, but I'd say the stuff should be kept in good nick.
Don't s'pose there's any way he can take it back to the shop and leave it in their delivery bay with a witness to say he's done so? | 
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