Which is what I was pointing out to Scratch.
No. What it means by take reasonable care "Duty of care" is that you will make the goods available for collection by the retailer. That is it. It does not have anything to do with if you use the goods or not. This is the only legal requirement under DSR.
It's a really badly worded document and needs amending.
Returning the goods
Unless you are required to return the goods, and you were informed of this, your only obligations are to make the goods available for collection and to take reasonable care of them while they are in your possession. This is called a duty of care. Where the supplier has made provision to collect the goods, this duty of care expires after 21 days, but where you have agreed to return the goods, your duty of care continues until you do this and could be for as long as 6 months.
DSR only applies to any goods were you have simply changed your mind. Anything faulty is covered under the sale of goods act.