For fans, the key issue may not be the action inside the ground but the movement around it.
That is a reminder that finals are policed in layers. The stadium is only one part of the map. Stations, road closures, fan meeting points and city-centre crowd flows often matter just as much.
Football finals already bring heavy security planning. Add rival demonstrations on the same day and the strain shifts quickly to the spaces between events. Delays on trains, bottlenecks near stations and tighter stewarding can alter the entire rhythm of matchday.
Reports suggest police and organisers are urging people to plan journeys early, allow extra time and follow instructions on the ground. It is standard advice, but on a day with overlapping crowds it becomes more than a routine warning. It can decide whether supporters arrive smoothly or spend hours navigating disruption.
The update says the priority is proportionate policing while responding quickly to offences. That balance matters in a city used to major demonstrations and high-profile football events. The aim appears to be straightforward: keep groups apart where needed, protect lawful activity and prevent flashpoints from spilling into supporter routes.
The next story to watch is how smoothly London handles the exit phase. Finals do not end at the whistle, and on a crowded day in the capital, getting supporters home safely may be the biggest result of all.