Piers Corbyn has revealed himself as the pensioner arrested in central London during anti-lockdown protests.
The brother of former Labour leader Jeremy Corbyn said he has been slapped with a £10,000 fine for his part in the 'Unite for Freedom' rally on Saturday which saw thousands descend on Trafalgar Square.
The 73-year-old, a climate change denier who set up controversial weather forecasting business Weather Action, said on Twitter he had been handed the fixed penalty fine as “organiser”.
In the tweet to his more than 31,000 followers, he called the demonstration an “epic success”.
He separately confirmed that he would "refuse" to pay the penalty and would "appeal the process".
Hours earlier, Metropolitan Police said they had arrested a 73-year-old man on suspicion of breaking newly introduced coronavirus laws.
He was punished, according to the Health Protection Regulations, for holding a gathering of more than 30 people in an outdoor place, Scotland Yard said.
He has now been released from custody.
In a statement, Metropolitan Police Commander Bas Javid said officers had been working "tirelessly" to remind local communities "that we remain in a health pandemic."
“Our interaction and intervention saw the majority of people gathered disperse," he said.
"Five people have been spoken to in relation to the new legislation."
Under the tightened measures, those attending a gathering of more than 30 people may be committing a criminal offence.
Mr Javid also warned that detectives had begun a "post investigation operation" which would enable them to "retrospectively take action" on "individuals contravening the regulations".
As further rallies took place in the capital throughout the Bank Holiday weekend, he added: "There are currently a number of demonstrations in central London and we are actively out on the ground, speaking with people taking part."
He said officers were "continuing to emphasis the public health risk and the regulations, and that it is incumbent on them to fulfill the requirements under the new legislation to (...) ensure that they are not committing an offence by being involved in a large gathering or they may be subject to a large fine.
Sunday saw hundreds of demonstrators take to the streets of west London to take part in the first ever Million People March to protest against systemic racism in the UK.
Organisers said they hoped the march will drive conversations about race, sparked by the Black Lives Matter (BLM) protests, and give the BAME community “a louder voice”.
The march took place this year in lieu of the annual Notting Hill carnival, though organisers said they aimed to incorporate the same spirit of freedom through peaceful protest.
Around 400 demonstrators walked along Bayswater Road from Notting Hill tube station, finishing in Hyde Park.
At several points along the way the crowd stopped, sitting down in the road and even breaking into a rendition of Redemption Song by Bob Marley, as demonstrators raised their fists.
The march was organised by Ken Hinds, an adviser to Scotland Yard, Sasha Johnson, a youth worker and activist, rapper 2 Badda, and author Anthony Spencer.
Mr Spencer said fighting systemic racism was a “huge task” and likened the struggle to rowing “from one side of the Atlantic to the other”.
“This is not a hardened protesters march, this is a family protest march for people who don’t normally protest,” he said.
“This is a million people march because of the numbers, we’re trying to have a louder voice.
“This is like a rowing expedition from one side of the Atlantic to the other side on a little boat.
“You start rowing but that rowing will stop at some point when you get to the other side, and that’s how we see this fight.
“It’s a huge task.”
Mr Spencer said the movement aimed to introduce a new initiative, the Race Offenders Register, to prosecute those committing race offences.
“This is a fight that can be won by laws. This is why the Million People March is asking about laws,” he said.
“The Race Offenders Register is a tool that we believe can begin the changing of behaviour right across wherever racism exists.
“We’re looking at bringing in laws to protect our black citizens.
“We protect everything else. We protect dogs, we protect eagles, we protect dead statues.
“Let’s protect people for a change. Let’s protect black people.”
“Once we see there’s actual true intention to protect the lives of black people and change systemic suffering, we will stop marching and we will work with the Government.
“Racism has been defined by the white population, not by us, we need to redefine racism to start this conversation again.”
Co-organiser Ken Hinds previously accused Met Police of discrimination after he was threatened with arrest for organising the march.
Organisers of Sunday’s demonstration reminded those involved several times throughout the day to adhere to social-distancing measures as much as possible.
Sasha Johnson, another co-organiser, said she hoped the movement would “empower the community to strive for better”.
“As a people, we’re not going to stop until we have equal rights and justice,” she said.
“Our message is listen to us, hear our words, we want sustainable and tangible change.
“We don’t just want tokenistic promises, we don’t want it to come from a hegemonic standpoint.
“We want it to be for the people."