I just noticed that wasps appear to be nesting insdie a partition wall here-
getting access via an airbrick about 2m above ground level. There is a lot of
activity- I don't know how long they have been there. I have read that by the
end of the year a wasps nest in the ground or in a loft etc may be the size
of an armchair, and would expect that if this is taking place inside a
partition wall, it would achieve about the same overall bulk but be spread
out some metres between the two walls. As far as I can see there is no way
they can get inside the building from the partition. I have read that wasps
are quite beneficial to the environment and especially the gardener so my
inclination is to leave it be, and try to remember not to run towards the
airbrick shouting and waving my arms and banging things, etc. I think a wasps
nest is deserted after one season- I wouldn't be quite so keen if I thought
this was going to repeat year after year.

The question is- can this still go disastrously wrong in some way if I leave
it there?

--
Vacutone