The 5-0 have a tactic of claiming that someone matches a wanted description/image and trying to intimidate them into providing ID. The young ginger haired chap was shielded by people present. The cops eventually left, tail between their legs to shouts of derision, when they double checked their intel.
Unfortunately, in the afternoon, two tracked vehicles and an armoured wheeled vehicle made it through as there just weren't the numbers to block them. I had my own personal escort of two cops keeping me off the road.
There was a young bloke taking video, who was concerned with the Chinese use of teargas against the (violent) Hong Kong protesters. Not so much about British weapons supplied to Saudi to bomb Yemen, or UK maintenance, training and targeting.