Racism to some degree or other will always exist in societies. I cannot ever imagine it will disappear. The real question is, as your post said, is it a serious problem in British society?
To answer that, we need to consider how we define a "serious problem" and what metrics we might use to measure it. This is where the debate often becomes heated. On the one hand, some argue that the prevalence of racism should be assessed through concrete data—statistics on hate crimes, disparities in employment and housing, and the like. These metrics can give us a clearer picture of whether racism is a systemic issue that permeates various facets of life in Britain. However, this approach is often met with resistance by anti-racist theorists who claim that metrics, facts, and figures are themselves oppressive, tools of the Euro-centric, White, cishet male-dominant hierarchy designed to maintain power.
These theorists would have us believe that the only way to truly understand racism is by focusing on the "lived experience" of individuals, particularly those from minority backgrounds. In this view, the feelings and personal narratives of these individuals are paramount, and any attempt to question or analyze these experiences through objective means is seen as an attempt to deny their reality. Under this lens, racism is always a serious problem, and it will remain so until the last vestige of perceived oppression is eradicated, which some might argue means until the last White person is dead—a hyperbolic but revealing indication of the extremity of this viewpoint.
But let's not indulge in such hyperbole. Instead, let's assume we adhere to the principles of the Enlightenment—reason, evidence, and rational discourse. By applying these tools, we might find a more balanced view. We should assess the extent of racism based on objective measures: are there significant disparities in how different racial groups are treated in key areas like law enforcement, housing, and employment? Are hate crimes increasing, decreasing, or remaining steady? What do rigorous studies show about implicit biases and their effects on society?
If the data shows that racism is a persistent, widespread issue affecting the lives of a substantial number of people, then yes, it is a severe problem. But suppose the evidence suggests that while racism exists, it does not constitute a crisis that demands radical overhauls of society. In that case, we must be careful not to overstate the issue. This approach allows us to address real problems without descending into hysteria that can sometimes cloud judgment and hinder constructive solutions.