Absolutely spot on Verne.. Thank you for your response..The reason i fitted the fire was because there was an old Back boiler behind the Breast which we replaced with a combi, and because of its modern looks with little thought of the old Flu.. I think now i'm gonna replace with a balanced flu Gas fire..So my next question then..is it a straight forward replace or do i have to do anything with the Flu to accept a Balanced Flu gas fire...??? Thanks again Verne...