Rhys,
I don't know about that MGA taillight arrangement, I was just trying to show a RHD version and it was late.
May have to give up on this # 7 question and move on but the research is fun.
I took a photo of our old unrestored MGA in our shop and also a Fairthorpe photo I found from a similar angle.
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MGA

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Fairthorpe Electron Minor


Ken H