Hello Stick , Thanks for your reply , tricky to explain but I’m trying to work out the correct layout of the two black pipes and connected hoses . That’s from the bottom of the main radiator to the heater matrix, rad reservoir and thermostat housing RHD. I know the route of the 8mm hose from the top of the main radiator to the top of the tank and the large hoses from the main radiator . Any help would be appreciated.