As the drama shows, private firms no longer able to pollute the coast of England of Wales just switched to rivers instead

There is a moment in Channel 4’s drama Dirty Business when Julie Maughan holds the body of her dead child and lets out an anguished cry. It is as brutal as it is compelling.

Her eight-year-old daughter Heather had just died in hospital, two weeks after playing in the sea on the beach at Dawlish Warren in Devon, where she contracted E coli O157, a bug which comes from raw sewage. She became ill with diarrhoea and blood loss. Transferred to Bristol children’s hospital, her parents agreed to switch off her life-support machine after she suffered kidney failure and brain damage.