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I can't offer you a recommendation but I would give you the following advice; damp is often classified as rising damp as some sort of great catch all when in my experience this is often not the case. Getting rid of damp is a process of elimination to narrow down, then find the cause and finally come up with a strategy to put it right. Get a number of people to evaluate the problem and immediately discount anyone whose first instinct is to inject a chemical DPC or put some kind of sink hole in the exterior wall as in my experience while there is a place for these treatments they should not be the first port of call. Also do not listen to anyone who uses an electronic damp meter.
Edited to make sense after ton poof rodding
Bobbo
@underuser53929
Anyone got ca recommendation for a damp proofing company, South West London - or would a decent builder be a better option?
About 15 years ago we had work done in the kitchen, this necessitated a new supporting column / pillar being built up. Over the last few years the plaster on this has bubbled and blistered, even the angle bead appears to rust up the wall. Now it’s got really bad and lumps of plaster are dropping off. The builder who did the work is a no go, too many problems. Another builder tried to fix it a few years back by cutting a gap to prevent bridging or capillary action but that does not seem to have worked
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