Hi, I have Victorian garden wall, the end of which has cracked due to subsidence caused by a tree. We are getting this removed and have been advised by insurers (who are not prepared to cover the work because garden walls are not structural)that the wall could be stabilised by concrete underpinning, after which the crack can be filled. The section that needs underpinning is about 1 - 1.5 metres in length. Could anyone recommend a builder for this kind of work? Thanks. Kevin Smith