Protesters hold up white paper some with writings commemorating the Nov 24 deadly Urumqi fire during a gathering at the University of Hong Kong in Hong Kong, Tuesday, Nov. 29, 2022. AP
Zheng Zeguang was called in to the foreign office after the incident involving Ed Lawrence in Shanghai, which Foreign Secretary James Cleverly had called "deeply disturbing".
"It is incredibly important that we protect media freedom," Cleverly told reporters at a NATO meeting in Romania, confirming Zheng had been summoned.
"It is something very, very much at the heart of the UK's belief system," the foreign minister said.
"It's incredibly important that journalists are able to go about their business, unmolested, and without fear of attack."
Lawrence was hauled away by police late Sunday while filming a protest against Covid restrictions, one of many that have rocked China in recent days.
The BBC said he was assaulted by police before being released several hours later.
China hit back at British alarm over the journalist's treatment and after Downing Street urged police show respect towards the Covid protesters.
"The UK side is in no position to pass judgment on China's Covid policy or other internal affairs," an embassy spokesperson said, before Zheng was summoned, noting Britain's own high death rate.
The government in London also this month expressed concern after reports emerged of Beijing operating undeclared police outposts in foreign countries including Britain.
- 'Golden era over' -
A senior Chinese diplomat was summoned to the foreign office last month after his consulate colleagues in Manchester, northwest England, were accused of beating up a Hong Kong pro-democracy protester.
The incidents have fuelled political pressure in Britain on the new government of Prime Minister Rishi Sunak to get tough with China.
But Sunak is treading a fine line between defending freedoms and antagonising the world's second-biggest economy.
In a speech on Monday, he said the so-called "golden era" of UK-China relations trumpeted by former prime minister David Cameron was "over".
But Sunak also called for "robust pragmatism" in dealing with Britain's competitors, disappointing critics who want him to go further in confronting Beijing.
Separately on Tuesday, the UK ousted Chinese nuclear firm CGN from construction of its new Sizewell C nuclear power station, which will now be built only with French commercial partner EDF.
That came after UK government departments were ordered last week to stop installing Chinese-made surveillance cameras at "sensitive sites".
The week before, a Chinese company was forced to divest most of Britain's biggest semiconductor maker, Newport Wafer Fab.
Sunak's spokesman declined to say if national security factors drove the decision on CGN.
But he told reporters: "Certainly we think it's right that the UK has more energy security, energy independence."