Snow hits London
Parliament Square in the snow

Large parts of the United Kingdom were affected by snow on Friday 18 January and this is likely to continue through 19 January, according to the UK Met Office. The red warning issued for Wales has been revised down to yellow, with warnings for ice. However, an amber warning remains in force for parts of North East England, Northern Ireland, Yorkshire & Humber, Grampian and Tayside & Fife.

London and South East England also have a yellow warning in place, with forecasts suggesting weather will be cloudy and cold with sleet or snow. The weekend forecast for London includes snow, icy conditions and temperatures as low as -3C.

The BBC reports that airports continue to struggle with the harsh weather and more flights have been cancelled. Heathrow is believed to be resuming normal operations but British Airways (BA) has warned passengers of delays, as it looks to clear the previous day's backlog.

BA said in a statement:

"We are doing all we can to help our customers after freezing weather and snow caused significant disruption to our schedule [on Friday]. There will be knock-on disruption to services on Saturday and we are advising all customers to check the very latest status of their flight via ba.com before leaving for the airport and if their flight has been cancelled not to leave home."

The National Highways Agency (NHA) continues to warn motorists to stay off roads unless travel is absolutely necessary. Road users are being asked to check latest weather forecasts for their region. The M48, Severn Bridge, was closed in both directions (J1 and J2) and will not re-open before 10am GMT on Saturday 19 January. The NHA advises traffic entering and leaving Wales to use the M4 Severn Crossing.

Train services have also been affected, with both South West Trains and Southern Railways publishing revised timetables.

The police have joined the NHA in advising people to stay indoors when possible and to avoid unnecessary travel. If travel is unavoidable, the advice is to consult local radio stations and their websites for further travel warnings and updates.

A Peace camp is covered in snow next to the Houses of Parliament, in Parliament Square, in central London. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
A Peace camp is covered in snow next to the Houses of Parliament, in Parliament Square, in central London. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Stefan Wermuth
The London Eye is visible through falling snow in central London, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
The London Eye is visible through falling snow in central London, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Stefan Wermuth
Two women walk through the snow in Richmond Park, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
Two women walk through the snow in Richmond Park, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Andrew Winning
An abandoned car in a country lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales, following a Met Office red warning of severe disruption.
An abandoned car in a country lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales, following a Met Office red warning of severe disruption.REUTERS/Rebecca Naden
Deer in the snow in Richmond Park, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
Deer in the snow in Richmond Park, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Andrew Winning
Four young people make snow angels in Parliament Square next to the Houses of Parliament, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads and causing power cuts and school closures.
Four young people make snow angels in Parliament Square next to the Houses of Parliament, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads and causing power cuts and school closures.REUTERS/Stefan Wermuth
A man walks in the snow in St James's Park, central London, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
A man walks in the snow in St James's Park, central London, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Stefan Wermuth
The branches of snow-covered trees hang over an empty lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales following a Met Office red warning for severe disruption.
The branches of snow-covered trees hang over an empty lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales following a Met Office red warning for severe disruption.REUTERS/Rebecca Naden
An abandoned car stands in a country lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales, following a Met Office red warning for severe disruption.
An abandoned car stands in a country lane near LLandissilio, west Wales, 18 January 2013. Heavy snow fell in Wales, following a Met Office red warning for severe disruption.REUTERS/Rebecca Naden
Members of the Household Cavalry Mounted Regiment cross Horse Guards Parade in the snow, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.
Members of the Household Cavalry Mounted Regiment cross Horse Guards Parade in the snow, 18 January 2013. A band of heavy snow affected most of Britain on Friday, bringing chaos to roads, and causing power cuts and school closures.REUTERS/Olivia Harris