The British Transport Police Divisional Commander for London, South and East England has said that police officers were assaulted at last night's New Year's Eve celebrations. Chief Superintendent Paul Brogden wrote on Twitter:
A mammoth clean-up operation has begun after millions of people across the UK celebrated the start of 2014 with fireworks, music and late-night drinking.
The festivities created an estimated 85 tonnes of waste, including up to 15,000 champagne bottles, in central London.
Westminster Council deployed 52 vehicles and 119 members of staff through the night to ensure the streets were cleared for the capital's New Year's Day parade at midday.
Tens of thousands of people came into central London to see in the New Year.
Viewing areas filled up quicker than in previous years, according to the Metropolitan Police with thousands of people arriving early to take in the spectacular firework display which has become a focal point for many to mark the New Years Eve celebrations.
Around 3,800 police officers were reported to have worked to support the event organisers and stewards, along with colleagues from British Transport Police and other emergency services.
As of 4:30am on January 1, there were a total of 100 arrests made by officers working on the policing operation for New Year's Eve.
London's New Year's Eve revellers will be showered with edible confetti and scented bubbles.
Billed as the world's first multi-sensory fireworks display, tonight's event is expected to attract hundreds of thousands of people to the banks of the Thames.
Simon Harris reports on the preparations ahead of the festivities.
NEW YEAR'S EVE:
Scattered showers initially, before rain quickly arrives.
The rain, sometimes heavy, will clear away eastwards this afternoon.
Breezy and brighter conditions will follow, along with a few showers later.
Maximum temperature 10 C (50 deg F).
NEW YEAR'S EVE NIGHT:
Although some places will have a dry start to the New Year, many locations will start off wet with blustery winds as showers spread east, sometimes heavy with hail.
Minimum temperature 4 C (39 deg F).
NEW YEAR'S DAY:
Rain and strong winds will spread east through the morning, with gusts of 50 to 60 mph likely.
Heavy showers follow later.
Localised flooding possible.
Maximum temperature 11 C (52 deg F).
Thursday windy with sunshine and scattered showers, perhaps with hail and thunder.
Friday and Saturday showers or rain, and very windy on Friday.
There'll be a strong police presence on London's streets on New Year's Eve, with 4,000 officers on patrol.
A quarter of a million people are expected to line the banks of the Thames to watch the fireworks display at midnight, while huge numbers are also expected in Leicester Square and Trafalgar Square.
Police are warning party-goers to be on guard during the celebrations, saying the event is a magnet for thieves looking to snatch bags. Officers will be walking along the streets and watching people from podiums to deter criminals and keep crowds under control.
Londoners are planning to spend £28 pounds more than the national average celebrating New Year's Eve. The UK's average spend to bring in 2014 is £50, but revellers in London plan to spend £78.
The Post Office Home Insurance survey has also found 74% of people are planning a night in at home or at a friend's house, to save money following Christmas.
The average predicted cost of celebrating New Year's Eve in the UK:
North East £38
East Midlands £44
South West £46
Union representatives have said they are discussing the possibility of co-ordinating strike action with the Fire Brigades Union, who are also due to walk out over New Years. The two strikes combined could see 7,500 workers walk out on one of the busiest days of the year.
In a ballot, 72.5% voted for strike action on a 23.1% turnout.