For completeness I provide all the readings of the emissions test in case these can be informative to the experienced eye!
Normal Idle Fast Idle
CO 0.19 (Max 0.5 PASS) 0.77 (Max 0.3 FAIL)
HC 120 (Max 200 PASS)
Lambda 1.04 (0.97-1.03 FAIl)
Lamda Probe Replaced today (pre second test)!
CAT replaced last year
No oil loss
No other symptoms