Hi Gareth if you read the first post it mentions its a single fan system, the easiest way to test the old system would have been to switch the aircon on and if its the fan gone it won't work, as for the fan coming on for the emissions test the tester must have worn his pants on his head and taught the wrong end to talk, has anyone checked the flow rate on these radiators its phenomenal, the total thesis behind emission reduction is cooler running this equates to bigger radiators, I have only had my fan come on naturally once since I have had my car and that was on the forty degree Tuesday we had this year and I was stuck in stop start traffic for ten miles on the M25 even then it was only on for about three min, when I had my cam belt changed they left it running for best part of an hour with no expansion tank cap on to get rid of any air and the fan never once kicked I can attest to that as I was standing right by it adding antifreeze as required.
Steve.