The electrical problem has now been solved. The Bristol regulator has left and right side 'A' terminals. It appears that the right side are fed by the white ignition switch cable rather than the dynamo. One snip and reconnection of the white cable has eliminated the drain.
I burnt out the dynamo and regulator using one of those emergency start chargers. Rather than shell out £130 plus I thought a brand new Bosch alternator for £25 could be substituted. Took a while to get a secure rear mounting.
After having the engine running for twenty minutes plus I thought I might try it on the road today. Got a few hundred yards down the road and it cut out. On choke it would run up and then cut out. Had to be towed back - oh the ignominy.
I think I will have to look at the petrol pump. If an electric pump is installed does the mechanical pump need to be removed?
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