On Fri, 22 Jun 2012 21:15:58 +0100, gremlin_95 wrote:

The above picture is a bit of an extreme example as it had been allowed
to develop as we were away for a few days.

That looks like a fungus of some sort, is it a leathery sort of growth?

Can anyone confirm what it is and how to get rid of it and stop it
happening again? The bathroom has an extractor fan which works, trickle
vent on the window and a gap under the door. The window is usually left
open in all but the coolest weather (and when the shower is in use).

Well the room is well ventilated but what is behind that red panel under the
floor or skirting? Fungus/molds generally like permenant damp, so you need to
find the source of that damp. Hidden leaking pipe, leaking window/window
frame, water on the floor not mopped up and getting behind those bits?

--
Cheers
Dave.