Thanks Kermit, on my 3 bearing currently sat in my Landy is a 45D dizzy. I’m not sure about the spare one but think it’s a slightly earlier 3 bearing - no engine number but with a 568750 head.
So the 25D won't work. I can't get a spark so I'm going to stick on a 45D which i know is working. I don't think this would be an issue swapping dizzys over would there?