[jeffwass]

FYI, you can report taxis idling with their engines running to the TfL. I wrote to them last year after regularly seeing waiting taxis idling their engines in front of my workplace, and they wrote back saying it’s unacceptable, and to email them with location, time, registration, and ideally some photo of the taxi.

Although I have seen an improvement in density of taxis idling their engines while waiting, though I now regularly ask normal drivers to turn off their engines when why’re clearly just waiting, often getting angry or hostile reactions.

So many drivers aren’t even aware that they shouldn’t run their engine while parked. At least in most London boroughs idling has become illegal with on-the-spot fines.

Some boroughs let you report any idling vehicles, eg Westminster : https://www.westminster.gov.uk/report-engine-idling