Quick update...
So since October the brakes have been working satisfactorily but consistently noisily and they were doing my head in given the amount of work that has gone on!
About 130 miles ago I replaced all the discs and pads with OEM Volvo parts
Thus far, the brakes now no longer howl and squeal and more importantly, as they bed in they become more positive
I have recycled all of previous pattern junk - including Bosch branded pads. Generally I am not convinced that you have to have OEM stuff but this has been a salutory lesson
Having replaced the valve rubbers and checked valve clearance, the old girl's going quite well at the moment!
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