[mothered]

Yeah, they do.

After thinking about this and what it will entail, I'm going to just send it.  I'm trying to quit smoking anyway so maybe this will help me on a bit lol.

It would be a good experiment though to see if the Royal Mail are vulnerable.  I may try it in the future, it could prove to be a good method.

By sending It off, you have nothing to lose and everything to gain.

It's a little harsh on their end not to accept damaged packages. Looking at It from a legit standpoint, you've sent the Item In good faith and was tampered with during transit. I don't see how an Item that was dispatched In It's proper form, Is not accepted due to something beyond your control.
Once you send It, It'll be Interesting to see the process on their end and ultimately the outcome.

I am selling it to an individual seller from Depop (A selling app similar to eBay). I didn't mean they do not accept damaged items, but if I took a ripped up parcel to my post office they would not let me send it however if from a legit stand point I took a perfectly fine package and the parcel was ripped after they had accepted it, it is their problem. This was the issue though, because if I try and make it look like it was tampered with and then take it to post office, they may decline it, or note what condition it is in.

Like you say, I have nothing to lose so I'm going to just send it, I already have received the money for it.

I see what you're saying with your post office.

Even If you make a small tear (just enough to justify the Item has been removed) and cover It with tape "almost" the same color as the packaging, It may well go unnoticed by the post office. That aside, If you get a moment, reply with the outcome.