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Many solid brick houses like yours would have originally had a vent or airbrick fitted exactly where you describe to stop condensation forming, as it's the coldest bit of the house. The new plaster might actually be where such a vent was removed... Has the wood been added? Link to streetview?
The reading might be going up after rain because it's generally colder when it rains so more condensation forms.
This is a half-decent quick bit of reading: http://www.heritage-house.org/about-condensation.html
Hefty
Thanks for your reply.
I never see condensation on the windows or walls which makes me worry that it is a structural issue. Logic would say it's coming from the roof but being told by the roofer that it's not has fucked that up that conclusion. I'm now thinking it must be coming from the outside wall where there is wood attached.
My builder doesn't have any suggestions so I'm tempted to either keep airing it more often and see if it changes things or alternatively get someone out to check the rendering and if not then get another roofer in.