Testing the power of a human dynamo

Jonathan Margolis conducts a unique experiment in harnessing pedal power.

Fact Box:

Busch & Müller E-Werk device charger, £140. Stockist details: www.amba-marketing.com, or call 01392-829903. Brompton M-Type Superlight bike, as used in video, £1,170 from Bicycle, 120a Sheen Road, Richmond upon Thames, TW9 1UR (020-8940 2274; www.mtbbicycle.co.uk). Design-Go Car Kettle to Go, £15.93 from www.amazon.co.uk.