ULEZ and Euro 3

[midden]

I've just put all my cars into the checker and I'm confused:


04 plate Skoda Octavia 1.9 Tdi doesn't pass (but I didn't expect it to).
our "new" 11 plate Skoda Octavia 1.6 Tdi doesn't pass (I expected it to)
My 55 plate 1.4 Ford Fiesta passes.


Now this is the bit that REALLY confuses me


I thought road tax is now based on emmissions:


The 11 plate Skoda is only £30 a year (bargain!) So, that's chucking out low emmitions, yeah?  But still fails ULEZ
The 04 plate Skoda was £125 a year so not so good, I get why it would not be included in ULEZ
The 55 plate Fiesta costs me £145 and the most expensive car in terms of tax and yet passes


WTF???


My cars don't pollute according to tax but do according to ULEZ!


Potty!

I Dare say TFL want you do their data base building for them and then ofcourse there's the extra revenue to be gained from those who won't question it.