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Two thoughts. Firstly, it looks like that cement plinth is breaching your slate damp proof course. It's not easy to tell from pictures. If it is, hack it all off.
Secondly, painting the wall will exacerbate any condensation issues, as the moisture cannot escape through the bricks. Also if you repointed in cement instead of lime then it cannot escape through the pointing either.
bq
this is the side/back of the house. the kitchen is inside this corner. Recently there has been a lot of condensation on the walls, more so than this time last year, so not just due to weather.
This channel down the side is gravel on cement. I removed a section of the gravel. Also I chipped a bit of the cement that runs up the wall, which came off but damaged the brickwork.
I repointed the back section recently, and added a coat of exterior paint.
Thoughts/Remedial suggestions welcome.