Thanks for all your answers, I didn't give a price because I wasn't asked, they were having major problems with damp on one side of the building caused by the blocked gutter and downpipe, so they just asked me to do it last time i did the windows.
This was a care home as well about 90 bedrooms , I think I'll go in at £1.50 a metre , that seems pretty fair looking at what others charge.
By the way my arms are feeling at the moment I would say its a bargain,
Cheers Dave.