Lancashire residents told to keep boiling tap water

United Utilities advises homes around Preston, Chorley and Blackpool to carry on with precautions after small levels of cryptosporidium bug found in supply

Hundreds of thousands of people in Lancashire have been warned to continue boiling tap water.

United Utilities first issued the advice last Thursday, after tests at one of its water treatment plants discovered traces of the microscopic bug cryptosporidium, which can cause sickness and diarrhoea.