Any question answered...

From the website: http://dshub.tradingstandards.gov.uk/explained

Refunding the costs of return depend on what a customer has been told and agreed to at the time of sale. The customer can be made to bear these costs if this is included in your contract terms and forms part of the information required to be given to customers

I'm intrigued as to what you're both saying. The bold bits in your posts don't match my interpretation of the text I've included above.

Sorry, mine was poorly written (AKA wrong).

For a DSR return (that is, one for any reason but within the cooling off period), the default position is that the seller must collect or pay for return postage. However if agreed at time of sale (i.e. usually via T&Cs) they can oblige the buyer to pay - NOT at a later stage.

The DSRs supposedly also say that if a return is due to faulty item the seller should bear all costs regardless of what it says in the contract - this is because technically they've failed to provide appropriate goods and are as such in breach of that contract themselves. But I've personally found businesses ignore this bit.