Thanks for the reply...yes , the belt is fine, the compressor clutch is working, the Air con blows ice cold!
I can live without it but over here it is also useful for clearing frost off windscreens as well as in the warm summers!..

It appears my idle and running remain fine but when i use the air con..' it plays havoc! ...even if i then switch the A/C OFF it still idles at 1200 and surges when you least expect it