What is the WLTP fuel economy and emissions test?

There was plenty of disruption in 2018 when the WLTP rules for new cars came into effect. But what are they and what does it mean for car buyers?
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Why DVLA is immobilising innocent motorists

Bugs in the new system for policing vehicle tax leave drivers at risk of being stranded even if they have paid what they owe.
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News: Pollution ruling may cost diesel car owners

Owners of diesel cars could see their vehicles plunge in value, experts have warned
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Car Clinic: Appealing a bus-lane fine, reducing diesel...

Sunday Times driving.co.uk experts answer readers' motoring questions in the regular Car Clinic advice feature