The other way around kind of.
I bought something from UK, arrived Lisbon when I went for some holidays and got returned to UK before I arrived home.
Asked my post office and they said that since was returned to UK nothing had to do with them.
Asked the UK seller and he says that never received nothing.
Even if I use the tracking supplied doesn't appear anything on the royal mail website, tried to contact royal mail but haven't found any contact.
The seller said he would go there and I even said I would pay everything but didn't got an answer from him again