What can I do about it?
Stop ignoring and start listening - it doesn't go away when you look away or turn off social media. You can read 75 things white people can do for racial justice and recognise (using the stats above) that similar things to the US are happening in the UK.
You may not already know this, but in the UK we elect a Police and Crime Commissioner (PCC) to hold our police to account democratically.
They are just as much of a representative as your MP or Cllr and yet few people know about them. You can find your PCC and email them. You can ask them what they are doing to reduce discrimination within and by their police force. If you have a personal story or something you've witnessed, you could tell them about it.
If you want to change the political landscape, join your political party of choice (Conservatives, Greens, Labour and Liberal Democrats are the main ones in the UK) and make them act differently locally and nationally. Put the issue of discrimination on their local manifesto and make sure they act on it. If you're a member of the Lib Dems you can also join the Lib Dem Campaign for Race Equality (LDCRE).
You could also read the Lammy Review and ask your MP what they are doing to make the justice system more equal.