Parents have been warned to make sure their children are up to date on all their vaccinations as polio is thought to be spreading in Britain for the first time in decades.
It comes after the virus which causes polio, a disease common in the UK in the 1950s but eradicated by 2003, was detected in a number of sewage samples in Beckton, East London.
While the risk is low, parents have still been reminded to ensure their children are fully protected.
