The UK police service has a long and proud history of upholding the right to lawful protest
This is far from true.
On 1st April 2009 the police in London mounted a full-scale attack on the freedom to demonstrate. Peaceful and defenceless protesters were herded into street concentration pens, held for hours against their will, beaten with riot equipment and had dogs set upon them.
The police acted with impunity, removing en masse their service numbers in order to beat, punch and otherwise assault the general public.
None of this happened because of bad apples in the barrel, but as a result of a police management that couldn’t give a damn about civil liberties, human or political rights.