 During the 1970s Britain suffered a major energy crisis and many politicians in the UK and US were astutely looking at alternative ways to transport freight in ways that could reduce dependency on oil.The decline of the British Empire and the opening of Tilbury docks caused the closure of the upriver docks on the river Thames and started a steep decline in traditional London lighterage which had transported large amounts of coal.Between 1967 and 1976 over 40 lighterage firms closed down.