Finally sorted !!!, I changes to BMW 316 disc 290 x 22mm which moved the disc inwards and allowed me to fit the Hispec 4 pot calipers. Now I have a brake, with a real good bite as soon as you press on the pedal without big effort. My conclusion from this is, its very difficult to get a good brake from a sliding caliper with a piston size of 56mm without a servo.
What I have ended up with is Disc 290 x 22mm Four pot calipers with 34.6mm pistons, Front master cylinder .625" and pedal ratio 5.2 :1 and loads of smoke out of the front tyres