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First I'd get out there when it's raining and try to get a feel for whether this is water rolling off the roof, or the effect of driving rain, or both. It looks like a lot of damp brick for a minor roofing issue, I would want to attribute it properly before attempting a solution.
Suspect the side of the house was rendered because of driving rain wrecking the brickwork, but WTF is that white staining coming through?
what can I do about this? Water's running off the roof and down the side causing damp on the walls inside.
Is this a known issue with gable walls, or is mine particularly shit and I need to have the whole thing redone?