Mine passed earlier this month with a decat, that was because I am friends with te mot tester... And it's local to Basingstoke as I am in Andover. Surprisingly mine was only just over the emissions limit with the decat fitted.
Thats interesting
So by your post it seems these cars are quiet efficent as it is, and the cat doesnt have much work to do to reduce the emissions.
Oh right that might be that sensor that VW put in lol
Wasnt the sensor to cheat a test at idle or underload in neutral?