I have just fitted a Safety Devices Roll Bar to my 2012 Plus 4 Supersport and when I came to start the engine afterwards, it would not fire. Also, a number of electrical gremlins appeared at the same time, eg no brake lights, indicators, horn, rear lights etc. I think I may have drilled through some wires when fitting the hoop to the cill board, although the plate was pre-drilled for location, and I would have thought this would have been taken into account at design stage if there are any wires close by.
I have not got a fuse diagram for the many fuses in the box in front of the heater box, although I am reluctant to fiddle as I may start an electrical short if I havn't already. I think my only option is to trailer it to my nearest Morgan Dealer and hope they can sort it out. Possibly an expensive conclusion, and I feel somewhat deflated!