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I tried to solve that sort of problem for many years and ended up cutting the plaster back to brick and using Humiblock plaster. I'm not sure where it goes now but I can't see it anymore.
Had another one at the front of the house which was caused by a soakaway that was full of silt.
I've heard of damp proof experts but it's one area of the building trade that everyone seems to disagree over.
not sure if there is such a thing, but can anyone recommend a anti-humidity wizard in SE? I though the humidity patch was raising through the garden wall and unblocking the adjacent waste pipe drain will solve it but after last two days of rains.... voila the fucker is back! Any leads will be truly appreciated!