Who are the colonisers that are not agreeing?
Eg: Recent filmmakers like Teplitzky or authors like Boris on Churchill don't mention Bengal famine or his utter conviction in white supremacy even once.
The notion that Churchill fought a war against 'racism' is also a very impressive piece of whitewashing. In reality Britain vs Germany was a war between the two most white supremacist nations at the time, Britain having had 300 years of mastery in the subject. Britain had to enter the war to survive, and not because it embarking on a humanitarian mission to save the world.
And the virtue of being on the winning side didn't mean Britain became less racist or white supremacist in its beliefs. Germany endured di-nazification, whereas Britain has never undergone a similar de-colonialisation program, parroting a triumphalist only propaganda agenda instead, which would have you believe that Churchill and white British soldiers won the war alone, whereas the truth is that it was USSR and USA interventions that sealed Hitlers fate.
Post war, it took 20 years for 1965 Race Relations Act, despite blacks and Indians being invited by Government to migrate specifically to rebuild their colonial master state, and its been just as slow moving since.
UK may have eliminated the crude overt racism that was commonplace until the 1990s, and some have changed their behaviours, or like majority of urban millennials and GenZ whom have only known a multi cultural society.
But a significant number have simply disguised their racism and practice it through hidden and insidious Amy Cooper type acts and micro aggressions, which every person of colour in Uk has experienced at some point.
From the perspective of people of colour, UK still has a long way to go.