The vehicle entered service with the British military in 1978.
In addition, some 1.3 million people and 340,000 vehicles a day enter the country.
However, the last complete vehicle did not enter service until 1983.
More than a million and half vehicles enter or leave central London every working day.
Several military vehicles had entered the grounds during the past half hour.
Two of the doors were large enough to allow vehicles to enter.
Currently, no vehicles are either entering or leaving the lot.
During an ordinary morning rush hour, some 875,000 vehicles enter the city.
The number of vehicles entering Manhattan on an average day grew from 728,000 to 880,000.
But some data suggests that, in fact, more vehicles are entering Manhattan.