A weather warning for rain, storms and floods has been issued as emergency teams work to stop a dam from bursting in Derbyshire.
The Met Office in the UK has issued its lowest yellow warning for much of northern England and the Midlands on Sunday, saying there could be damage and disruption from floodwater and lightning strikes - potentially hampering the race to stop the dam in Whaley Bridge from bursting.
Water levels at the Toddbrook Reservoir have been reduced by half a metre since Thursday but the damage to the 180-year-old structure remains at a "critical level".
Boris Johnson visited the damaged dam on Friday, describing it as "dodgy but stable" and a "substantial risk".
If the dam collapses, destruction could be wreaked on "the whole of the village below, on livelihoods, on families, on homes", the prime minister said.
Residents have, however, been told they can briefly go back to their homes.
It will be one person per household, and they will go at "their own risk", said Kem Mehmet, assistant chief constable of Derbyshire Police.
The decision to allow people to collect pets and belongings had been "difficult", he said, and it would happen in a "controlled" fashion.
In the meantime, he urged people to "stay away from Whaley Bridge".
The water level needs to drop by "several more" metres, the Canal and River Trust said, with further high-volume water pumps being brought in.
An RAF Chinook has been dropping one-tonne sandbags to bolster the damaged reservoir wall.
