And this is where the plot thickens......
On looking at an old picture of what I think is the G3 rally Coupe 8v engine, which was a 1800, that also has the disti driven from the exhaust cam in the same way. Not having any 1800s sold here makes it difficult, but anyone have any pics of the 1800?
May have a look at my S1 parts book and see what it says......
Peter