Sky News reports:
New Banksy artwork being removed from Royal Courts of Justice wall in London
HM Courts and Tribunals Service (HMCTS) has taken the decision to remove it due to the building being listed and therefore legally protected.
According to Ask the Police, Graffiti is an offence of criminal damage...
[https://www.askthe.police.uk/faq/?id=71688f49-1184-ec11-8d21-6045bd0f03e3]
But this is 'art' so even the Royal Courts can't prosecute, but maybe the images on the 'artwork' should have been reversed.
Helch!