Ask for a return address and then poo through their letterbox.
Solid advice right here. Bend off a big old chocolate slug on their doormat
Never mind my moral compass, I think you need to try thinking before you speak, so far you are the only person who has jumped the gun with their response, did you even bother reading the whole thread? I fully appreciate this is a delicate situation where I am questioning other peoples opinions to try and form my own morally correct opinion of what to do.
There's not really any morally correct opinion to form. If you're a person that believes in doing the right thing, your immediate reaction would be to contact the supplier informing them that they've made a mistake, not to post up on OcUK to see if people would keep the item because that's what you wanted to do in the first place. I can't believe that if you already knew that the right thing to do would be to get them to collect it, that you'd post up here asking that. You were simply seeking validation in your belief that you're entitled to keep the product. So from that point of view, your moral compass doesn't work.
Contact the seller and send the item back. Maybe ask the seller to pay postage. Simple really I would say.
If they don't contact you then don't worry as you tried.
I reckon its a top of the line fleshlight![]()

I have two of these. Can vouch that if he owned one of these, he would not be shy about singing their praises![]()

Except he bought this item, it just took longer than expected to arrive.
It is in no way unsolicited goods.
OP should inform the seller that the item has now arrived and give him reasonable opportunity to have it collected.
Just to get it straight, it's theft if the seller requests its return and he refuses.
Otherwise, it's unsolicited good until that point.
its not as he requested the goods.
He did, but has since broken the contract by cancelling the purchase and requesting a refund.
6 Interpretation.
(1)In this Act, unless the context or subject matter otherwise requires,—
“acquire” includes hire;
“send” includes deliver, and “sender” shall be construed accordingly;
“unsolicited” means, in relation to goods sent to any person, that they are sent without any prior request made by him or on his behalf.
“unsolicited” means, in relation to goods sent or services supplied to any person, that they are sent or supplied without any prior request made by or on behalf of the recipient.