Thank you to all the contributors. I think that comprehensively covers everything. The range of technical issues which get brought into play are quite mind blowing and I can see why an engine management system is near enough mandatory.
It is always worrying when the only reason for doing something is to take advantage of a tax differential rather than for a good underlying reason.
I was working on the basis that as few Bristols seem to have this conversion it probably meant it wasn't the best idea in the box. It does make sense that the best way to do this would be to start at the setup for the Bleinheim 4, which I know caused much hair pulling and teeth nashing at Bristol Cars whilst they perfected it. As Greg says it works very well in that car.
It seems a classic case of 'If you want to go there, I wouldn't start from here' Perhaps if I were starting from scratch with a car it might work, but as I already have an uprated engine, courtesy of Geoff Marsh which works very well, I will live with the fuel cost.
Perhaps I will get a letter from the PM congratulating me on my outstanding contribution to the exchequer!
Perhaps not.
Paul
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