interior wall

I've been slowly renovating an old 1800s listed building which was suffering from a lot of damp. I've managed to combat a lot of the damp in the house by installing French drains, fixing gutters, reverting to Lime plaster but there's one room which is completely throwing me and not sure how to...

Hi all, I’m looking for opinions and advice as to what the issue I am experiencing is and a solution for it. Please see my attached photos; a section of the exterior wall under my bay window has what looks to me a damp patch (particularly worse when it rains, as it is today when these photos...