Bump FAO Peteattheboro.
I would just destroy it, it's clearly too close to yours, and I assume he never bothered to ask if it was ok to build a mud hut right next to your castle in the middle of the sea.
It's been weeks since you first posted, he's either not been on since then, or not done anything about it.
Just have the stacks of dirt ready to give back should he want them.
.

