A tangible example? An apology. The Australian government under Kevin Rudd managed to put together a public, televised apology on behalf of previous government's to the Indigenous people that were massacred, stolen from their families and forced to assimilate into white culture. It may be token but it helps people start to heal.. As far as I know it's not something that's ever been done in the UK or the USA.
Another? Remove monuments to racism, several streets in Melbourne are named after men who 'discovered' the land, these people were involved in genocidal massacre of the Indigenous population in other parts of the country. Remove them and publicly acknowledge the removal. I'm sure these exist in the UK and they definitely do in the USA.
Speaking on Australia again, allow indigenous people to be involved in politics and decision making. It's their land. You may not think these issues relate to the UK, but it's systemic and all linked.
As I've said, I don't have all the answers but steps like this are the bare minimum in my mind and I'm not a black/indigenous person, so I can't imagine how they must feel having to live with these nods to colonisation and slaughter in their lives. Plus the ongoing, flow on effects they live with day to day.