Well the UK could do what Germany did post WWII when they removed all Nazi iconographia and statues of Nazi leaders, not commemorate notable locations for the Nazis at all (and in fact built a parking lot over where Hitler died), and instead create monuments, statues, and memorials to the victims of their atrocities while also making the history of that mandatory in school syllabuses. Instead of idolising slavers and the architects of Imperialism and colonialism, they could isntead create memorials to the Atlantic slave trade and remember those affected by it.
But the UK doesn't want to remember or teach it's role in the Atlantic slave trade beyond "we said it was bad before America so we're pretty cool right?", and they don't want to memorialise those affected by it because that would draw attention to the continuing systemic racism which pervades British society, which affects those descended from "freed" slaves to this day. It would also require they teach students that while slavery was nominally illegal in Britain, British people still contributed to and profited from the Atlantic slave trade massively in British colonies, which would also require more nuanced approaches to British Imperialism and colonialism that might cause people to think "actually maybe the reason the Commonwealth hates the UK is because we were bad, actually".