Finally got round to this, was only one piston that was sticking on the off side, all others were free and clean so clamped those in place and used the pedal to pump out the problem one, was a bit dirty so cleaned up the Piston, bore and seal seat with a mixture of wet and dry and a metal scribe to get the crud out of the groove. Reassembled with new inner seal, dust seal and circlip now all seems good again but guess only time will tell.
As a tip, I found a bolt with a few old copper washers through the banjo bolt helped seal of the brake line seeing as you can't clamp braided lines.
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