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weareleeds - Aha, there wasn't an o-ring on the old one I took out and I didn't spot the slight recess groove for it to sit in. Many thanks.

Thanks for responses, comment to ChrisR, yes, but not the one your thinking off, had O ring left over but no obvious location for it. Fitted the flat rubber washer onto the top of the new plastic/nylon bobbin and yes checked that had got a good seal surface with internal brass body. Cleaned...

When running hot water (dhw) and with central heating off I am getting hot water "bleed" into the central heating system which is obviously reduceing the efficiency of the dhw supply. Have just replaced all diaphrams/o rings/seals etc ref hydraulic assembly repair kit thinking this would...