thank you for help and reply . it failed on high CO the pass mark for CO was 32 it came in at 62, all the others were fine, the HC 31 pass 200, Lambda was 1012 pass 970/1030 ,the natural idle test pass 630/830 ,the tester suggested cataclean and take it for a drive and keep the revs over 4500 , which I did and returned for retesting, sadly not enough of a affect on the CO it lowered from 62 to 50 ,so the conclusion was failed or blocked cat. I put a fault code reader my jag and obtained the following codes P0420 Catalyst system efficiency below threshold (bank 1) P0430 Catalyst system efficiency below threshold (bank 2) ,it runs lovely its hard to believe it got a fault , but it is all new state of the art mot diagnostics there
regards to all liam