Thanks for all your help so far, especially B20F for confirming our thoughts re that nylon plunger. It won't go back until bleeding is complete.
Today we decided to redo all the copper brake pipe ends using the flaring tool that makes double-flares, and I must say they look very similar to those on the old pipes, so assume this to be the proper way. If time available will refit tomorrow or Friday, cross all our fingers and toes and try to bleed them again. I note you advising possible air bubbles in those valves underneath, so will be especially thorough on the rear brakes AND will bleed in the order in the books!
Will send progress report when/if successful.
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