Hi again Beans. I think I managed to answer my own question!
I found a pack of old photos from 1994, and going through them found a photo of the coil location. Looks like it goes right there.
When faced with an empty engine bay which was stripped around 25 years ago, it is amazing how the smallest thing can be a mystery. Equally, it is amazing how just one photo can solve the riddle! I don't remember taking these photos, but hallelujah I must have taken them with reassembly in mind.
Moral of the story for any newbie restorer - photos, photos, photos!
Thanks again and all the best
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