An interesting point: during the floods, a large angaling lake was flooded and a number of its inhabitents escaped, including a number of Wels catfish. Wels are native to the UK, but only in the largest rivers and lakes where there is enough food to support them to grow up to a large enough size to breed. So when these have been released, they will be eating everything in the rivers around the flooded areas to suport their bulk, wiping out the ecosystem and then eventually dying of starvation.