Engine is abd.
I got told today that is slight possiblity is that my sub earthing out and causing the car to cut out.
I've taken the power off the battery for the sub and took it for a quick drive and it hasn't cut out. Not counting my chickens just yet. Ill take it for a longer drive later and see what the crack is then.
My fingers and toes are crossed that is just a stupid thing like that!