Riverside communities along the Ouse in Yorkshire and Thames are among those most at risk from expected floods, the Environment Agency has said.
Groundwater levels are high in Berkshire, South Gloucestershire and parts of Lincolnshire and temporary flood defences remain in place along the Severn, including at Ironbridge and Upton.
Work is also taking place to ensure that rivers can drain and flow freely in other parts of southern England, including Dorset, Hampshire, Wiltshire, West and East Sussex, the Environment Agency has said.
Farmers unable to get winter crops in the ground because their land is waterlogged have told shoppers to expect rising food prices in 2013.
Hundreds of flood warnings are in place across England and Wales, with Scotland warned to prepare for heavy rain.
As much of the UK faces flooding and the heavy rain continues, will Christmas be a washout?