Snow and ice are causing further misery for travellers across England, with problems for air passengers and disruption on the roads and railways. With more heavy snow predicted and bitterly cold temperatures, motoring organisations are warning of potentially fatal driving conditions. Overnight temperatures fell as low as -19.6C in Chesham, Buckinghamshire, and -15C in other areas of the South. Freezing fog is causing problems for commuters in northern England. Forecasters warned of heavy snow across the South West on Monday, which could move towards London and the Midlands. The British Airports Authority has issued an urgent appeal to travellers not to come to Heathrow unless they know for sure their flight will leave. A spokesman said there was a huge backlog after flights were cancelled over the weekend because of snow and ice on the runway. Abandoned cars Thousands of people were forced to spend another night at the airport because of the chaos. British Airways was hoping 60 flight will depart from Heathrow on Monday morning, but dozens more have been cancelled. Gatwick said the airport was returning to normal, but passengers should check with their airlines. On the trains, passengers still face delays and cancellations following the weekend's heavy snowfall. A number of train services have been cancelled in eastern England and on suburban routes in south-west London and Surrey. Some London to Leeds and London to York services have been cancelled. There are long queues at St Pancras station in London for Eurostar services to Paris and Brussels. Driving conditions on the M5 in Somerset are described as "treacherous" and there are reports of motorists abandoning their cars on the motorway. The chaos follows the severe problems faced by travellers on Sunday. * Hundreds of rail passengers were left stranded in Peterborough overnight after icicles caused overhead power lines to fail. * Drivers on the A34 in Oxfordshire faced eight-hour queues and some were stuck in their cars overnight. * A tanker carrying liquid petroleum gas overturned on the M25 in Kent, causing police to close the motorway in both directions between junctions five and six for several hours. It has since reopened. * Six people had to be rescued from freezing water after a dinghy sailing trip went wrong in blizzard conditions, off Alnmouth, in Northumberland. Source: BBC