"Alternativly if you don't have a compressor to hand grab 2 tyre levers or similar - put a bar between them so the ends lever outwards and place inside the piston cavity - make sure the caliper is held solid and pull - generally works with the most stubbon of pistons."
That's the best tip I've heard in ages, thanks. 5 pistons popped out, one is still jammed in. So I'll put it all back together and use the brake lever to force it out. But I was well impressed with the tyre lever approach, I used steel bicycle lever from Halfords, £2.99.
cheers,
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