Reuters: A quarter of British homes, with a total value of around 600 billion pounds (US$1,178 billion), are at risk from flooding caused by heavy downpours and rivers overflowing, a leading disaster modelling firm said on Tuesday. Yet many homeowners are unaware of the danger they face because the government does not include properties at risk from overflowing drains in the flood maps it provides to the public, Risk Management Solutions said. “The Environment Agency’s maps only …