Early-morning fog disrupted flights at airports today.
London City Airport experienced delays while there were 30-minute hold-ups for both incoming and departing flights at Heathrow in west London.
London City said: “Due to low visibility this morning, flights to/from London City Airport are experiencing disruptions.
“Passengers are advised to contact their airlines for more information regarding their flight status.”
A Heathrow spokeswoman said: “We’re hoping that the visibility will improve soon.”
On the railways, passengers were affected by a series of broken-down train problems.
These caused delays to Greater Anglia services into Liverpool Street station in London as well as hold-ups for First Capital Connect passengers between City Thameslink and Blackfriars stations in London.
A broken-down train also led to delays to Northern Rail services between Skipton and Shipley in Yorkshire.