With the line at around 3.5 miles long, mourners who have made the last-minute scramble to see the Queen s coffin this evening can expect to queue for around seven hours.
The plans have been honed over years, a strict timetable of procedure for what will be the biggest state funeral and security operation ever held in the UK.
An estimated million people will line the streets of London to witness scenes of breathtaking pomp and splendour, punctuated by historic moments of sorrow and solemnity.