We see oil being transferred from a large ship (Regent Royal) to a smaller boat (Regent Swallow) in a dock (probably Bristol) and then the Swallow transporting the oil up the River Severn (the destination looks like Gloucester but locations are not confirmed).
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Regent Oil had a facility at Stourport on Severn but the locations are not clear in this film. Regent was the brand name in Britain for oil and petrol sold by the American Texaco company.