Temperatures are set to fall as low as -10C, with snow forecast for London, the South East and Scotland and yellow warnings for ice in place for much of the rest of the UK.
A yellow warning for snow is in place over much of Kent and Sussex tomorrow morning.
There is also a yellow warning for ice with wintry showers expected across Northern Ireland, Wales and northern England as temperatures fall.
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Drone footage shows snow-covered village
The cold snap comes after widespread flooding left big parts of the country submerged in the past week.
The Met Office issued a lengthy warning for snow and ice for northern Scotland from Sunday to Wednesday.
“A few centimetres of snow are likely at low levels over a given 24-hour period, with the potential for 10-15cm above 200 metres, especially across parts of the Highlands,” it said.
“Ice will be an additional hazard, especially Tuesday night.”
Residents have been urged to be careful of icy patches on untreated roads, pavements and cycle paths, and longer journey times by road, bus and train services are likely.
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The yellow warning for Kent and Sussex is in place between 2am and 8am on Monday morning.
“There is a chance that heavy rain will turn to snow in places, which may cause some travel disruption on Monday morning,” the warning said.
“There is a small chance of travel delays on roads with some stranded vehicles and passengers, along with delayed or cancelled rail and air travel.”
The forecaster added: “By Sunday most of the UK will be in the northerly airflow, with lower temperatures spreading further south overnight.
“Showers will fall increasingly as sleet and snow in the north, even to lower levels. Some showers further South and West, and perhaps a more persistent spell of rain overnight into Monday, could also turn to sleet and snow mainly over high ground such as the Brecon Beacons, Exmoor and Dartmoor.
“Overnight frost will become more widespread by Monday night, with overnight temperatures below 0°C across much of the UK. Temperatures could get down to -10°C in sheltered glens, or across high ground areas of Scotland where there is lying snow.”
In addition to the nosediving temperatures, more than 100 flood warnings are in place across the UK.
The Environment Agency had issued 119 flood warnings and 192 flood alerts in England as of early Sunday morning, up from 98 warnings and 169 alerts on Saturday.
Earlier, flood defences, including boarding, were deployed in York city centre.
City of York Council said it had taken the measure to keep the area “safe and open” as it urged visitors to plan their journeys in advance.
Rescue workers used a boat to navigate the floodwater in the centre of York after the River Ouse burst its banks.
Conservative Party leader Kemi Badenoch has called on Sir Keir Starmer to sack Treasury minister Tulip Siddiq over allegations she lived in properties linked to allies of her aunt, Sheikh Hasina, the deposed prime minister of Bangladesh.
It comes after the current Bangladeshi leader, Muhammad Yunus, said London properties used by Ms Siddiq should be investigated.
He told the Sunday Timesthe properties should be handed back to his government if they were acquired through “plain robbery”.
Tory leader Ms Badenoch said: “It’s time for Keir Starmer to sack Tulip Siddiq.
“He appointed his personal friend as anti-corruption minister and she is accused herself of corruption.
“Now the government of Bangladesh is raising serious concerns about her links to the regime of Sheikh Hasina.”
Ms Siddiq insists she has “done nothing wrong”.
Her aunt was ousted from office in August following an uprising against her 20-year leadership and fled to India.
On the same day, the prime minister said: “Tulip Siddiq has acted entirely properly by referring herself to the independent adviser, as she’s now done, and that’s why we brought into being the new code.
“It’s to allow ministers to ask the adviser to establish the facts, and yes, I’ve got confidence in her, and that’s the process that will now be happening.”
Police in Aberdeen have widened the search area for two sisters who disappeared four days ago in the city.
Eliza and Henrietta Huszti, both 32, were last seen on CCTV on Market Street after leaving their home on Tuesday at around 2.12am.
The sisters – who are part of a set of triplets and originally from Hungary – crossed the Victoria Bridge to the Torry area and turned right on to a footpath next to the River Dee.
They headed in the direction of Aberdeen Boat Club but officers said there is no evidence to suggest the missing women left the immediate area.
Specialist search teams, police dogs and a marine unit have been trying to trace the pair.
Further searches are being carried out towards the Port of Aberdeen’s South Harbour and Duthie Park.
Police Scotland said it is liaising with authorities in Hungary to support the relatives of the two sisters.
Chief Inspector Darren Bruce said: “Eliza and Henrietta’s family are understandably extremely worried about them and we are working tirelessly to find them.
“We are seriously concerned about them and have significant resources dedicated to the inquiry.”
The sisters, from Aberdeen city centre, are described as slim with long brown hair.
Officers have requested businesses in and around the South Esplanade and Menzies Road area to review their CCTV footage for the early morning of Tuesday 7 January.
Police added they are keen to hear from anyone with dashcam footage from that time.
TV presenter Katie Piper has revealed her decision to get an artificial eye, 16 years after an acid attack that left her with life-changing injuries and partial blindness.
The Loose Women panellist, 41, is an advocate for those with burns and disfigurement injuries.
She shared a video of her being fitted with the prosthetic on Instagram.
Piper said: “After many years battling with my eye health, I’ve reached the end of the road somewhat, and the decision has been made to try a prosthetic eye shell.
“This marks the start of a journey to have an artificial eye, with an incredible medical team behind me.
“As always I’m incredibly grateful to all those in the NHS and private health care system for their talent and kindness.
“I will share my journey, I’m hopeful and nervous about being able to tolerate it and would love to hear from any of you in the comments if you’ve been on this journey or have any advice.”
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Commenting on the post, presenter Lisa Snowdon said Piper was a “warrior” and a “true inspiration”.
Piper has undergone hundreds of operations after suffering an acid attack arranged by her ex-boyfriend in March 2008.
She gave up her right to anonymity and made a documentary in 2009 called Katie: My Beautiful Face.
Piper also founded the Katie Piper Foundation which supports survivors of life-changing burns and scars, and has received an honorary doctorate from the Royal College of Surgeons to mark her ground-breaking work.
She was made an OBE in 2021 for her services to charity and burn victims.