Police clashed with anti-lockdown protesters today as thousands of demonstrators descended on central London.
Footage shows officers in riot gear being confronted by large groups calling for restrictions to be lifted.
Protesters gathered in the capital to voice their anger over lockdown measures, as well as the government's Police, Crime, Sentencing and Courts Bill.
Actor Laurence Fox, who has previously signaled his intention to stand for London mayor, was among them - prompting sharp criticism from followers on social media.
Pictures show thousands of people without face masks blocking traffic on London's Park Lane.
They also marched through Hyde Park and were pictured and filmed clashing with police in Piccadilly.
The Met Police told The Mirror that no arrests have been made so far.
It comes as protests are held in other cities across the UK, with hundreds of demonstrators marching through central Manchester today.
Piers Corbyn, the brother of former Labour leader Jeremy Corbyn, gave a speech at Hyde Park corner.
Protesters were seen walking through Hyde Park chanting "stand up, take your freedom back!" and “Burn your mask!”
A man held a banner reading: "Free your face."
Police urged people to stay home and adhere to coronavirus lockdown restrictions.
Pictures show flares being set off, crowds marching and a heavy police presence.
The Met Police - which last week came under fire for its heavy-handed response to a vigil in memory of Sarah Everard - said officers are "engaging with those gathering" today.
It urged them to disperse or go home.
The Metropolitan Police Events team tweeted this morning: "We're aware groups are planning to travel into London today to protest.
"Our city remains in a health crisis, gatherings risk spreading the virus and are unlawful.
"We have a policing plan in place throughout the day.
"We'd urge people to reconsider protesting and stay home."
Yesterday, police said in a statement: "The Met is aware of several groups intending on gathering in and around central London on Saturday, 20 March, for the purpose of protest, despite the country remaining in lockdown to protect the public from the spread of coronavirus.
"Current government legislation makes gatherings in groups of more than two people unlawful, unless exemptions apply.
"Gathering for the purpose of a protest is not an exception under the Covid-19 regulations.
"The right to protest must be balanced against the rights of others and the protection of public health.
"In the interests of public health, the Met is telling people not to attend central London in order to gather to protest.
"By gathering in large numbers, there is a risk of spreading the virus that has claimed so many lives.
"A significant policing operation will be in place throughout the day to engage with people who are in breach of the regulations.
"Those gathering will be encouraged to return home, if they do not, they face necessary and proportionate enforcement action. This could be a fixed penalty notice, or arrest."
A similar protest has taken place in Manchester, with people branding lockdown a "crime against humanity".
Around 500 protesters who rallied together could heard chanting "freedom" and "take off your masks".
One of the protesters, Luke Scott, said he lost his source of income this year due to the lockdown and criticised the government's decision-making which he said had "no basis in science".
Mr Scott, who runs an events company, said that the lockdown was a "crime against humanity" which has caused people to suffer financially, physically and emotionally.
The 33-year-old said: "Today we are urging the government to change their regulations around the lockdown.
"We are handing in crime reports at the headquarters to report the crimes the government are committing.
"We are marching against the dangerous language they are using which are causing mental health issues, physical issues, closing businesses.
"No scientific evidence, we don't know if this virus is the threat they say it is.
"My business was destroyed by the lockdown. I lost my income, I have an eight month old child, I have a wife. I've made no money this year.
"These are crimes against humanity."
Meanwhile, Health Minister Matt Hancock said half of all adults in Britain have now had at least one Covid-19 vaccine dose.
Britain reached that figure after administering a record 660,276 shots a day earlier, Hancock said.
Mr Hancock added that the successful rollout of the vaccine means Britain is on track to ease lockdown measures in line with its roadmap.
He told Sky News: "There is no sign that we won't be able to make progress as set out in the roadmap."
Prime Minister Boris Johnson, who had his first dose of the AstraZeneca vaccine yesterday, tweeted: "Let's keep going".
It comes after the Police, Crime, Sentencing and Courts Bill passed its second reading 359-263 after it was overwhelmingly backed by Tory MPs this week.
Police will be able to tell one-person protests to stop shouting and impose noise limits, start and finish times on gatherings.
Even Tory ex-PM Theresa May - who presided over a "hostile environment" as Home Secretary - said she was worried about "potential unintended consequences", adding: "Freedom of speech is an important right in our democracy, however annoying or uncomfortable that might sometimes be."
But Tory MPs defeated a Labour amendment, 359 votes to 225, which would have killed the entire Bill and forced the Tories to draw up a new one.
