Garden shed conundrum
So there’s this shed sitting next to the pathway that leads to both mine and my neighbor’s back garden. The land registry says it’s shared access, so owned by both of us.
This shed once belonged to my downstairs neighbor who died last year. The house was left to her sister and she eventually sold it to my new neighbor who has been there for six months.
The shed is locked and I assumed the sister would have given the new owner a key to it, however I’m pretty certain they have not because I’ve never seen them use the shed even though they have been out in their garden every day, weather permitting, for the last two months planting flowers and trees, laying down pavers, etc. In fact they leave all of their tools, flower pots, all the stuff you would normally keep in a shed out in the rain. To make sure of this without being too conspicuous I piled a small mound of dirt in front of the shed door which has sat undisturbed for nearly a month now. All that to say they must think it’s mine because they’re not using it at all.
Anyway this is all going on as I’ve been considering buying a shed for myself.
Wife says I should tell the neighbor but truth be told he’s been an absolute dick head since he moved in, like asking the retired woman next door if he can buy her house for his son when she dies (yes really). And also constantly leaving rotting food in open bags which are then strewn around their garden by sea gulls and foxes despite me asking him to please place bags in the bin instead of setting them on the ground. For this he went door to door to all the other neighbors to complain about me, though they all told him the same thing and that it would attract vermin.
Anyway I’m generally a friendly and honest person and probably would tell him otherwise but in this case, to recap: he doesn’t have a key, doesn’t know that it’s his, is in fact a dickhead, and it is sitting on property I own in a perfect spot that doesn’t take up any room in my actual garden.
What should I do?
Edit: The lock on the shed is incorporated into the door so no padlock to simply cut off