This is common in East, South and North London. I live in East where everyone is a try hard but stuff like this always happens to the point the police are always outside shops. I've seen several fights happen in my area
I think the worst one I saw was this all out gang attack, a group of 10 teenagers rushed a blonde girl, threw her onto the ground and kicked and punched her in the face. The teens left and police were called in immeadetly