The message
from Kay contains these words:

Stonework not brickwork! Bigger lumps, and bigger opportunities for
cavities

So all I need to do now is convince the builders that they'll not be in
danger? ;-)

They've got to get to the chimney top to feed the liner down. Even
bumble bees and similar can get their wild-up.

However, if the nest isn't in the lumen of the chimney, they *SHOULDN'T*
have any problems.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
http://www.users.zetnet.co.uk/hi-fi/