Only Fools and Horses: Mother Nature's Son (1992)

Synopsis

Strapped for cash as ever, Del is clearing Grandad's allotment, which has become a health hazard and where he finds some bottles of yellow liquid, which he dumps. He also finds a tap, hidden by rocks, but claims that there is an actual spring, yielding 'Peckham Spring Water'. Using a bottle of mineral water for the lab test he gets the water accepted and sold to a supermarket chain. Unfortunately he is unaware that it has been contaminated by the same yellow liquid he chucked in the reservoir an