On 14 May, 00:51, mike wrote:
(Posting for some friends) They live in a first floor flat and have
had a water leak underneath the kitchen units. The leak has been fixed
but unfortunately seems to have been going on for some time.

As a result there are water stains on the ceiling of the flat below.

For now they are just trying to dry the place out because of the awful
smell. Trouble is they cannot get at the affected area. They have some
kind of "stuck on" floor tiles onto the floorboards. Beneath that is
the ceiling void and they have managed to get a hole to that to try
and blow warm air to dry things out. No luck so far.

I thought maybe a heat gun directed in there (I know it needs great
care - so maybe not worth the fire risk). Is there a better (& safer)
way to get warm air in there to dry things out?

A heat gun in a confined space sounds very scary to me! I've used a
hairdryer before, which works OK if the damp area is quite localised.
Don't leave it unsupervised though!
Jon.