Idling a Diesel engine on cold start

[haaammit]

It's not always illegal :-


Taken from Here :-

The legislation does not apply to:
•vehicles moving slowly due to road works or congestion
•vehicles stopped at traffic lights
•vehicles under test/repair, or
•vehicles defrosting a windscreen in very cold weather.

That's referring to something different.

sigh - I mentioned this in post #37

It is not illegal to leave a vehicle unattended whilst running if it's not on a public road, therefore the blanket statement that

It's illegal to leave a car unattended with the engine running.

to which I replied

It is not illegal to leave a car unattended with the engine running.

and to which you replied

It is.

Is quite simply not true.

Look - https://www.gov.uk/general-rules-all-drivers-riders-103-to-158/control-of-the-vehicle-117-to-126 section 123 - public road is the bit you want.

Do you now understand? Maybe you could just admit you were wrong.