Clive,
As you and Geoff D have said their were quite a mixture of threads on the car and I was of course forgetting the brake pipes which have some UNC fittings.
I am sure I have somewhere the fitting for a servo pipe I took off the engine when I put it into another 401 years ago because I pinched the blanking plug off another engine, if I could find that it would serve as a pattern. A least I have one spare blanking plug to copy. I will see what Bristol Cars turn up next week and may well take you up on your kind offer to make a small batch of plugs and take offs.
Geoff.
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