London Lockdown Protest 21st June 2021: Part 3 - The arrests

It is very noticeable how the behaviour of the police changes when there are fewer people at these protests.

They really are not supposed to be wearing them when dealing with the public. Also, if no-one has the right to tell someone they should take a mask off, as the police officer suggested, why does anyone have the right to tell someone they should put a mask on?

"When you do not need to wear a face covering...
police officers and other emergency workers, given that this may interfere with their ability to serve the public..."
https://www.gov.uk/government/publications/face-coverings-when-to-wear-one-and-how-to-make-your-own/face-coverings-when-to-wear-one-and-how-to-make-your-own