Many thanks for your suggestions. I gave myself a day off yesterday considering my options if the slave cylinder is at fault. If the clutch plates have been contaminated I fear that much as I like the car (and it's ULEZ compliant...) that might be the end of the car.
I will continue trying to isolate the problem and follow up with the results, and yes, I did remove the insert in the new master cylinder which I noted had been removed from the MC I replaced.
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