harry wrote:

The other thing that can go wrong is incomplete fill due to not enough
fibres being blown in.


In my daughter's case they started but after taking out an air brick noticed
some wiring in the cavity. Apparently the surveyor was supposed to have
done trial holes and used an endoscope to check first. The fitter said he
couldn't accept any liability for *any* damage that occurred after that, so
wrapped up and left.

And yes they were going to fit air vents for the two ( currently unused)
chimneys.

I still haven't decided how to get around this problem.

AJH