i THINK (not 100%) you can just blank off the outlet on the thermostat housing that goes to the turbo and then again on the header tank, as said the water for the heaters goes along the drivers side of the block in the metal pipe, around the back of the block and into the back of the engine on the passenger side, i am in suffolk (lowestoft) and have a saph and 3 door if you wanna have a look?