After a rally against cuts in London, a break away group caused a scuffle during a smaller demonstration outside the Savoy hotel.
The scuffle began after a protester took a doorman's hat. The top hat was later returned to him. No one is believed to have been seriously injured during the incident.
More top news
Can you guess what film the cow was trying to watch?
New 'smart ticketing' plans will also be introduced so travellers can receive automatic compensation payments for late trains.
The 41-year-old father of six died last Thursday - a week before he and the band had been due to begin touring in North America.