YORKSHIRE Water has warned people not to swim in its reservoirs during warm weather, saying a quick dip can turn to tragedy.

Recreation and catchment manager Geoff Lomas said reservoirs were extremely dangerous due to the chilling temperatures and the potential for strong undercurrents.

“What began as a day out in the sunshine can turn to tragedy within minutes if you decide to take a dip,” he said.

“It really doesn’t matter how well you can swim as it’s the cold which can kill you.

“Most people won’t realise that, as soon as your body feels the shock of cold water, it’s natural defences kick in. The first sign of trouble is hyperventilation but, if the swimmer stays in the water, the body will gradually shut down to protect the vital organs and muscles will go into cramp.”