Do bear in mind that it's a fact of life that no damp-proofing
contractor will ever, ever tell you that a recurrent damp problem is due
to problems with the work they did and that in the entire history of
mankind, no DPC guarantee has ever been honoured (Clarkson mode off)

David

Snap. There are people who say there is no such thing as rising damp. Where
I live (old limestone house, built straight on the limestone, at the bottom
of a hill) I sometimes think if I set a tap into the wall, I could use it as
a spring.