Are there any (planning) restrictions at all on the construction of
tree houses for childrens' play? In the situation I have in mind,
someone is erecting what appears to be a fairly substantial and
permanent structure up in the sky directly overlooking a neighbour's
garden. The neighbour presumably is limited in defence by the 2m (?)
height restriction on fences. The tree house certainly extends well
above that, and it has a raised deck outside well-suited for kiddies
to stand on and lean over the wall.

I realise that of course the tree-house-builder's family have a right
to enjoy their garden too, but what makes it particularly unfortunate
is that the tree house is situated directly adjacent to a bit of patio
and garden seat in the victim's garden. So it's not even as easy as
just planting a big tree - they would have to dig up the patio and
relay it in different spot (and it's already in the best place,
centred on a south-facing wall). Anyone got any better ideas?

This is in Scotland, if that matters. Of course there is a fair chance
that the tree house will fall into disuse in a few weeks anyway...

James