Hi Guys, thanks for the prompt replies. I have spoken to a local garage about changing from a tandem system to a single line one, and he said that it would not make any difference so long as it met the minimum requirements when put on the brake roller/tester. However, the hand brake efficiency will have to meet a higher standard as this 'emergency' brake would not also have either the front or rear brakes working if there was a leak in the system.
Going down the GT6 method would still require a new master cylinder, so do you think this would be better than just fitting a single line one from the earlier 1500 model?
Cheers, Grahame