The Metropolitan Police have launched a major security operation ahead of England's European Championship clash with Scotland on Friday amid fears of a mass invasion by the Tartan Army.
Hundreds of officers will form a ring of steel at Wembley to prevent ticketless fans accessing the stadium, and there will be a significant police presence in tourist areas of London such as Trafalgar Square, as well as at Kings Cross and Euston stations.
Scotland have a ticket allocation of 2,800 in the reduced capacity crowd of 22,500, but thousands are expected to travel to London regardless.
All 32 trains departing Edinburgh and Glasgow for the capital are fully booked, and southbound services from Manchester are also extremely busy.