British police arrested 14 people in the south-west town of Bristol on Saturday as around 200 people protested against nationwide lockdown measures.
Authorities had already warned against the march going ahead because of recently introduced, month-long restrictions.
Piers Corbyn, the brother of former Labour Party leader Jeremy, was among those detained.
"This gathering is unlawful and is putting others at risk. Arrests have been made as people have failed to comply with the directions of officers," the local Avon and Somerset police force said on Twitter.
"One arrest has also been made after an officer was assaulted."
Demonstrators were urged to return home.
"We recognise the right to freedom of expression but protests aren't currently allowed. Covid-19 is deadly and the restrictions are in place to prevent its spread," police added.
The government was forced to reintroduce lockdown measures in England in an effort to tackle a second wave of Covid-19. The virus has killed more than 51,000 people across the UK.
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A woman wears a face mask as she walks past a mural of a nurse in Manchester. Reuters -
People attend an anti-lockdown protest outside the Senedd Cymru in Cardiff Bay, Wales. AP Photo -
A sign appealing to the public to follow guidelines in Manchester. Reuters -
A person wearing a face mask walks across London Bridge, with Tower Bridge in the background, at sunrise in London. AP Photo -
A worker adjusts a face mask on a mannequin at a shop in Nottingham. Reuters -
A man wearing a face mask walks along the River Mersey in Liverpool. Reuters -
A person wears a Union Jack face mask in Newcastle Upon Tyne. Reuters -
Members of the public wearing face masks stand near a statue of The Beatles in Liverpool. AP Photo
