Hi Paul, Problem solved. The expansion tank IS seperate. I removed the air filter housing, moved over the power steering reservoir and the small round reservoir that attaches to the rad housing next the top hose. I then un-clipped the hose thats fits in the bottom of the expansion tank (there is only one) The tank is now free. I then very carefully wiggled the tank around and it finally came free. It was stubborn to get it out. To fit the new one, just reverse the process. The only trouble I had was the top house kept leaking, but all in all wasn't difficult. Once again thanks mate.