He also organises an annual 25-hour drive around the M25 called the M25 spin, repeated every year on the weekend closest to 23 March (with many KLF fans from around the world joining in).
It is open to volunteers between the ages of 18 and 45 who reside or work near London, within the M25.
The scheme envisages a 35-mile high-speed rail route linking the two airports in 15 minutes, with trains travelling at a top speed of 180 mph parallel to the M25 and passengers passing through immigration or check-in only once.
He was seriously injured in a coach crash on the M25 motorway near London on 4 January 2007 in which his wife Christine was killed.
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In 2002, Gilbert wrote and recorded the soundtrack for "London Orbital", a film by Chris Petit and Iain Sinclair based on Sinclair’s psychogeographical exploration of the M25 motorway.
On leaving the Colne at Uxbridge Moor in the Colne Valley regional park, the Colne Brook flows close by to the west until West Drayton then passes under the M25 motorway at the M4 "Thorney interchange", enters Berkshire and flows through the village of Colnbrook.
From its base at the Royal London Hospital in Whitechapel, east London, the helicopter can reach any patient inside the M25 London orbital road, which acts as the service's catchment area, within 15 minutes.