Thick fog engulfs parts of UK as temperatures to plummet to -10°C

People exercise in the fog on Parliament Hill in north London (Picture: Hollie Adams/Getty)The Met Office has issued a severe weather warning as heavy flog blankets London and the south.A yellow alert covering the capital and across eastern, southeastern and southwestern parts of the country remains in place until 10am.Motorists are warned to take extra care on the roads as visibility may be affected.The fog could cause slower journey times with delays to buses and trains, and even cancellations