LONDON (AP) — The most senior Black adviser to U.K. Prime Minister Boris Johnson has resigned, the government said Thursday, the day after a report on racial disparities concluded that Britain does not have a systemic problem with racism.

The government denied any link between the departure of Samuel Kasumu and the much-criticized report, which activists and academics have accused of ignoring the experiences of ethnic-minority Britons.

The prime minister’s office said Kasumu would leave his job as a special adviser for civil society and communities in May, as had “been his plan for several months.”

It denied the resignation was related to Wednesday’s publication of a report by the government-appointed Commission on Race and Ethnic Disparities, which concluded that Britain is not an institutionally racist country.

But Simon Woolley, a former government equalities adviser and a member of the U.K. House of Lords, said Kasumu’s exit was connected to the “grubby” and “divisive” report.

“(There is a) crisis at No. 10 when it comes to acknowledging and dealing with persistent race inequality,” Woolley said.

Kasumu had considered quitting in February. He wrote a resignation letter, obtained by the BBC, that accused Johnson’s Conservative Party of pursuing “a politics steeped in division.” He was persuaded to remain temporarily to work on a campaign encouraging people from ethnic minorities to get vaccinated against the coronavirus.

The Conservative government launched the inquiry into racial disparities in the wake of anti-racism protests last year. The panel of experts concluded that while “outright racism” exists in Britain, the country is not “institutionally racist” or “rigged” against ethnic minorities.

Citing strides to close gaps between ethnic groups in educational and economic achievement, the report said race was becoming “less important” as a factor in creating disparities that also are fueled by class and family backgrounds.

Many anti-racism activists were skeptical of the findings, saying the commission ignored real barriers to equality.

“Institutionally, we are still racist, and for a government-appointed commission ... to deny its existence is deeply, deeply worrying,” said Halima Begum, chief executive of the Runnymede Trust, a racial equality think tank.

Doreen Lawrence, who became a leading anti-racism campaigner after her 18-year-old son Stephen was killed in a racist 1993 attack in London, said the report's authors were “not in touch with reality.”

“Those people who marched for Black Lives Matter? It’s denying all of that. The George Floyd stuff? It’s denied all of that," she said.

The report was also widely disparaged by academics and scientists, who said it ignored the interplay of factors such as poverty, class and race in creating inequality.

The coronavirus pandemic has highlighted racial fault lines, with Britons from Black African and Black Caribbean backgrounds dying from COVID-19 at more than twice the rate as their white compatriots. Jobs, underlying health conditions and deprivation are all factors in the divide.

Writing in the British Medical Journal, public health experts Mohammad S. Razai, Azeem Majeed and Aneez Esmail said “structural racism is an important factor in ethnic disparities in health” and accused the report of using “cherry-picked data” to support a political agenda.

“Its attempts to undermine the well-established and evidence-based role of ethnicity on health outcomes will lead to a worsening of systemic inequalities, putting more ethnic minority lives at risk,” the authors said.

Black people in Britain are also three times as likely as white people to be arrested and twice as likely to die in police custody.

Like other countries, Britain has faced an uncomfortable reckoning with race since the death of George Floyd, a Black American, at the knee of a U.S. policeman in May 2020 sparked anti-racism protests around the world.

Large crowds at Black Lives Matter protests across the U.K. last summer called on the government and institutions to face up to the legacy of the British Empire and the country’s extensive profits from the slave trade.

The toppling of a statue of 17th-century slave trader Edward Colston in the city of Bristol in June prompted a pointed debate about how to deal with Britain’s past. Many felt such statues extol racism and are an affront to Black Britons. Others, including the prime minister, argued that removing them was erasing a piece of history.

Johnson insisted Thursday that his government was not downplaying racism. He pointed out that the commission made 24 recommendations, including setting up an office for health disparities, sending low-level drug offenders into the public health system rather than the criminal justice system, and ensuring police forces better represent the communities they serve.

“There are very serious issues that our society faces to do with racism that we need to address,” he said. “We’ve got to do more to fix it, we need to understand the severity of the problem, and we’re going to be looking at all the ideas that (the commission) have put forward, and we’ll be making our response.”

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