Two people were found dead a cellar in the west of England, raising to at least eight the number of people to have died as a result of record rainfall that has washed out many summer holidays.
The pair was believed to have been overcome by fumes from a petrol-powered pump as they tried to remove water from the basement of a rugby club, police said.
Up to 350,000 people in central parts of the country remain without running water after the floods damaged power sub-stations and knocked out sewage systems.
In the past two months, Britain has experienced the highest rainfall since records began in 1766, leading rivers to burst their banks and forcing up to 10,000 people from their homes.
Insurers have said the combined cost of the June and July floods could top 3 billion pounds ($6 bln). There is also expected to be a heavy impact on agriculture, with farmers warning that any more rain could affect harvests.
The army is distributing 3 million bottles of water a day to people who no longer have access to drinking water.
The deaths follow the disappearance of a teenager from a severely flooded town last Friday and at least six deaths from widespread flooding across northern England in mid-June.
While floodwaters may have peaked and were expected to start receding on Thursday, the Met Office, the country's weather forecasting agency, issued a warning for severe rainfall in almost exactly the area already affected.
It said up to 30 mm of rain could fall in some areas of Wales and western England in the coming hours. - DDNEWS India