The challenge was the latest in a series undertaken by presenter Adam Green and others for the appeal.
This was Greg's third outing for Comic Relief in 10 years, after previously completing five triathlons in five days for his ...
Manor Road South, in Esher, was closed following the crash but it has since reopened.
The Radio 1 Breakfast Show host has ridden from Weymouth in the south of England to Edinburgh, all to raise money for Comic Relief.
Watch live as Greg James attempts an incredible 1000km cycle - on a tandem bike - all to raise money for Comic Relief.
The Breakfast Show DJ leaves Weymouth on a tandem bike on day one of his 630-mile trip across the UK.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results