Over half an hour, Rod King, the founder of 20's Plenty for Us, sets out the case for a standard urban and village speed limit of 20mph and describes the road to getting there.
The campaign began in 2007 and now has 500 local campaigns and thousands of campaigners.
Both the World Health Organisation and the United Nations say that 30kph/20mph should be the norm.
Only 10 per cent of people in the UK oppose reducing 30mph limits to 20mph and it is already in force in the majority of UK urban areas.
