TT40- Oh yes please that would be wonderful. I will PM you.

Marydean - I thought of that expandable filler too. I am hesitant to use it though as if something ever happens to the pipes or if I get the spa bath I want it may cause more issues than the mice.

Lisa & Shan - Thanks. I might have to put a few pots of it around.

I have a fernery on the otherside of the bathroom wall (outside). Do you think that would be a factor as it is probably quite warm and damp in thje fernery. The house is on a slab so I have no idea how they got in there in the first place