Anybody ??? 

I need this urgently for tomorrow because I have the gas conversion
man coming up to change it to a closed loop system.   

Will not bore you all with the details, but I had this converted last
week & although it has a cat, I have only got an open loop system
(which I have been advised is bad news for the CAT)

Many thanks & sorry to make my first post a request, we tend to find
sites when we're in need don't we !!