A friend of mine had a similar problem.
Apparently after a day in the Disputes Court you need to have advertised the fact it has been left and to be removed or sold etc in the public notices.....bit old fashioned but that the way it appears to work.
....and it appears unlikely you can charge storage unless agreed earlier in writing.
I would not to anything rash as it may come back and bite you.
Best ask a legal type.
Still the idea of sticking it on TM and sending the link to him has some appeal....
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