Same experience here. I have been know to take stuff back other people
have disposed of because it broken and that shouldn't matter either its
the product that guaranteed not the receipt.

But the Sales of Goods Act applies only to the original purchaser, as it is
based on the implied or explicit contract of sale.

Whether a separate manufacturer's guarantee is transferrable to a new owner
is up to them, as is any conditions attaching to receipts, etc.

Christian.