I too had starting issues with my old Brise 'AX' starter fitted to my 7 - thought it was going to be a useful upgrade, but I quickly removed it again... IIRC correctly, on starting the Emerald kept tripping out - the car was always a pig to start from cold, but I just thought it was the car being difficult. It was only when a friend mechanic who knows 7s, pointed out to me that on cranking the Emerald kept clicking out - you could hear it, although I hadn't really noticed it before. Anyway, cutting a long story short, I did a bit of research online and found some articles stating the problems some Brise starters cause with 7s. Thankfully I had kept my original Magnetron starter which I refitted tout suite and all the problems went away! I don't begin to understand what was causing the issue, only glad it went away. Also made me realise why the second-hand Brise starter I had bought was in such good condition - I suspect the previous owner had the same issues I experienced.