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mabrad
As far as I'm aware, the damp proof course is usually at a level just below the cement parging for these sort of walls (which I'm assuming is a Victorian cross / Flemish bonded solid wall) - and it looks like the ground level breaches that, which could be contributing to any damp.
The cement (I'm assuming it's not lime) rendered wall the right could be channelling water behind the render, particularly where there's the cracking behind the soil stack - this could also be adding to the damp problems.
The UPVC casement door could be causing problems - juxtaposing modern watertight materials against 100 year old leaky brick can channel water & damp, particularly if installation involves hacking away & damaging older brick & mortar.
And the paint could be preventing the wall from drying properly. Especially if the wall is plastered in gypsum on the other side.
How is the damp presenting itself inside?
Baby wipes & grease can be removed by a person with a pressure for £100.