A40 crash
Debris and damaged vehicles involved in a multiple car collision on 28 December 2016. Daniel Leal-Olivas/Getty Images

Freezing fog will again sweep across parts of England and Wales creating the potential for yet more chaos just a day after a driver was killed on the A40.

The Met Office has issued a yellow weather warning for south-east England, the Midlands and inland Wales warning of "dense fog" and more "difficult driving conditions". On Wednesday (28 December) a woman was killed in Oxfordshire on an icy stretch of the A40 that was shrouded in fog.

A spokesman for the Met Office said: "Combined with temperatures below freezing, there is also the risk of ice forming on some untreated surfaces particularly later in the night and early on Thursday morning.

"The fog patches are expected to slowly thin during Thursday, although some patches may persist throughout the day – most likely in a zone from the West Country to Eastern England."

London's City Airport, which on Wednesday had at least 77 flights cancelled, has already had 11 more cancelled on Thursday morning because of the foggy conditions, and many are delayed. A tweet from the airport read: "Due to earlier foggy weather conditions flights may be subject to delays, passengers are advised to check with airline for flight info." A City Airport spokesman told IBTimes that they "continue to monitor the situation on the airfield and Met Office forecasts."

Heathrow airport, which suffered major delays on Wednesday, is bracing itself for more of the same today. "Foggy weather may affect scheduled flights today," a tweet said. "Please kindly check your flight status with your airline."

The post-Christmas cold snap has prompted experts to issue health warnings for the elderly. Dr Thomas Waite, consultant in Extreme Events and Health Protection at Public Health England said: "The effects of cold can be severe, in particular for those who are over 65, have a long term illness, or are not mobile.

"Our advice to these groups is when indoors, have plenty of warm food and drinks and try to maintain indoor temperatures to at least 18<sup>C. If mobility isn't an issue, keep active as best you can.

"If you need to go out wear lots of thin layers and shoes with a good, slip-resistant grip to prevent any accidental falls. It is particularly cold at night this week, so drawing the curtains at dusk will keep the heat in."