CHANGE AT THE PUMPS: ROAD TO THE BAN

1921: Lead invented as an additive for petrol.

1955: Lead banned from petrol in Russian cities.

1967: Professor Derek Bryce-Smith organises conference.

1969: Banned in the US.

1981: Lead cut by two-thirds.

1982: Clear launched.

1986: Unleaded two-star petrol introduced in Britain.

1988: Unleaded petrol cheaper than four-star.

1992: EU says new cars must have cat converters and run on unleaded petrol.

October 1999: Lead-replacement four-star introduced.

1 January 2000: Leaded petrol banned.

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