I don’t think I’m welcome in London any more. Not in a car, anyway.

Here's why. Mike Hawes, chief executive of the Society of Motor Manufactureres and Traders (SMMT), recently said: "The London Ultra-Low Emissions Zone will play a key role in driving the market for ultra-low-emission vehicles in Europe's leading mega-city, and set a precedent not only in the UK but around the world.

"SMMT supports this vision and wants to see London meet its air quality and climate change targets, while driving innovation and supporting jobs. We are pleased to see the Mayor has recognised that the latest diesel technology has a place in an Ultra Low-Emissions Zone. It is only by encouraging motorists to invest in the latest, lowest-emission technology, regardless of vehicle or fuel type, that the Mayor's vision be fully realised."