The expansion of the ultra-low emission zone (Ulez) to cover all of London means that from Tuesday travellers setting off for Heathrow airport will have to pay the daily charge for the first time if they use an older, more polluting car to get there.
While people who regularly drive into the capital will probably be aware of the rollout of the scheme, the motorists most likely to be caught out are those making a rare visit to the airport when they go on holiday or those dropping off and picking up friends and family.
