More than 120 areas across the UK are on flood alert with heavy rain set to fall over the weekend.

The Environment Agency increased the number of areas at risk overnight as rain continued for a second day.

While the worst affected places are in the South West, 128 areas across the South East, Midlands, central and northern England, Wales and southern and central Scotland are also on alert. A further 15 areas across the west, as well as in Northampton and Warrington, are expected to flood, the agency said.

Around 30 commercial properties were flooded yesterday in the coastal town of Looe, south Cornwall, as a band of heavy rain swept in from the Atlantic.

Tom Tombler, meteorologist for MeteoGroup, the weather division of the Press Association, said: "The heavy rain will affect mostly the western parts of the the UK and southern England as well as Wales.

"The risk of localised flooding remains throughout the day, especially in areas which saw heavy rain yesterday. Between 10mm and 20mm is expected in the worst-hit areas. Temperatures will remain milder though, around 10C for most areas."

The heavy rain is expected to stay for the weekend, before a brighter start to the week, he added, although the rain will return on Thursday.

Firefighters praised the speedy actions of three hunters who found a man desperately clinging to a tree following a flash flood. Crews were called to a brook, near the River Exe in Devon, which had swollen to around 6ft deep. More than 12 firefighters helped rescue the man, who was taken to hospital suffering with hypothermia.

The fire service said it believed he had taken a wrong turn while walking back to his home in Exwick, near Exeter, before slipping into the brook.

Sean Faulkner, from Devon and Somerset Fire and Rescue Service, said: "Luckily there was a group of three gentlemen who were out hunting and they heard his cries, because it was in the middle of nowhere, and they raised the alarm. If it wasn't for the swift actions of the men and the crew it could have been a different outcome."