I know cavity wall insulation is discussed fairly regularly here, but
I can't recall this aspect being covered recently. If it has, I
apologise.

I have the chance to have my home cavity insulated on a grant. I'm
encouraged by the grant, less encouraged by the fact it seems to push
me towards a single installer.

But my main problem is that my neighbour in the adjoining house
(semi-detached single-storey houses) doesn't have and doesn't want
cavity insulation. That means that if I have it installed, there has
to be some dividing line where my insulation ends. I'm concerned this
may cause dampness at the 'edge' and lead to complaints from my
neighbour.

Any views or experience?

John