There will be massive traffic disruption until after the funeral. Basically all roads around Buckingham Palace through to Victoria St, Over Lambeth Bridge along to Westminster Bridge, Victoria Embankment up through Trafalgar Square to Piccadilly Circus and Piccadilly will be closed to through traffic for ten days. That's a square mile of the busiest roads in town. With several other disruptive road works elsewhere it's going to be a nightmare getting anywhere. Add in thousands of visitors to pay their respects and lousy weather forecast f*ck knows what's in store...