New battery and new regulator - so far so good.

Also read up on the operation of the dynamo/regulator/battery - now I know

As far as I know, there is no power going 'through' a regulator. The +ve wire allows the regulator to 'see' the voltage in the battery. It then sends a signal to the alternator/dynamo using the exciter lead to switch the dynamo on/off. The charging current is carried by the cables coming off your dynamo. As far as I can work out anyway

I just keep forgetting to attend them,my wife has no interest in other people junk to quote her,also that I've got enough of my own