Roland Perry wrote:
In message , at 14:36:49 on Sat, 14 May
2016, Someone Somewhere remarked:
The TfL site is astonishingly opaque regarding what cars are allowed
or not. They can't even be bothered to install a query based on
numberplate.

It appears to say that Euro 6 diesel cars must be less than 5years
old, but doesn't mention any of the former Euro ratings.

NO

What it is saying is that vehicles of this age are guaranteed to be
Euro 6 compliant (because that is the date that manufactures were
required to meet E6).

Older vehicles may be compliant if their particular model met Euro 6
standards before the required date.

Euro 5(D) cars will never be compliant whatever their age

Like I said, astonishingly opaque. My V5 doesn't say what Euro-foo the
car is, and TfL can't be bothered to help. Wonkypedia doesn't say
either. After a lot of digging it appears to be Euro 4 (diesel).

They do say - they say if it isn't on your V5 then you need to take the
year of manufacture into account and gives the relevant years for the
relevant cars.

No, because they don't have a way for me to discover what Euro-foo my
vehicle is, and even when I jump through numerous external hoops, fail
to say what the implications are.

If the answer is "not allowed inside the North Circular" the least they
can do is tell me. But how will they police it - congestion zone cameras
twice as far out as now - sounds like a trojan horse for congestion
charges inside the "circulars".

Allowed inside the North Circular, but you will have to pay the charge.