"Part of the reed bed had been burnt and there were substantial areas of rushbeds and saltmarsh vegetation, " he said.

BBC: Fire at Parkgate

In the next 20 years, the report says, Britain is likely to lose at least 13, 000 hectares (130 square kilometres) of saltmarsh, mudflats and coastal lagoons.

BBC: By BBC News Online Environment Correspondent Alex Kirby

You will swap the tube for the trail on the one-day Food Safari tour, led by foraging pro Nick Saltmarsh, one-time supplier to famous London restaurant Le Gavroche.

BBC: The art of urban foraging