Hi All, just wondered if you might have advice on how to fix what might be penetrating damp. We have some damp patches on the first floor bedroom walls (Victorian terrace), which become a bit more pronounced when it rains heavily. We’ve ruled out leaks. No signs of water in the loft but some cracking in the external wall render (picture attached). No damp patch on the left side of the window so possibly the crack higher up is to blame? The damp patches are on the wall facing outside and the party wall. A damp surveyor looked at the external wall but did not think it was the cause, so not sure what to do next. Any advice gratefully received.