Thank you for your replies. I intend to convert my Brum to 12V and I am certain that I remember someone saying that they had a late Zener equipped Brum. The trouble with the Scott is the radiator is right where every other manufacture fitted their Zeners and as well as taking up the obvious place it’s not a good idea to site one near a tank of hot water !
On first glance at Kev’s photos I thought he had attached it to the fork yokes but it looks more like the top centre radiator fixing bolt. Is this correct Kev ? I also intend to use the Triumph heat sink and a small Lucas rectifier also as I think that this would give a semblance of originality but perhaps a modern regulator with the alternator on full output is a better idea.