Disclaimer that I’m not English and don’t particularly have a dog in this fight, and my opinions are a little mixed. On the one hand, I agree on the morality there, a lot of people were damaged in the very long term by slavery. But on the other, even if you can say that it’s an act to attempt to return the wealth to the wronged people, that doesn’t mean the wealth has simply been sitting there for nearly 200 years, waiting for return. That money has to come out of some budget, somewhere.
So where are they going to pull 18 trillion to give reparations from? Certainly, cuts will need to be made somewhere to make it happen, and often, those cuts are usually made along the lines of political agendas rather than things that are objectively bloated.