Thought I'd update this as I had an interesting call with Overdrive Spares today.
They recommended the first thing I try is to drop the inspection plate, clean out the filters and most importantly clear out the bleed port between the solenoid and valve closest to it. There is a hole less then 1mm and when that blocks it causes my symptoms. Fingers crossed it just all just needs cleaning out.
I'm not looking forward to doing this job. It's going to be intricate, messy and very awkward under the car.
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