A new map from Shoothill, who created the previous flooding map for Facebook.

GaugeMap is a visualisation of the Environment Agency's gauges, which can also be accessed via the EA site itself.
This offers an immediate visual check on which rivers might be reaching a point (or have gone beyond the point) where flooding is possible.
At the time of posting there were 17 rivers at that point.
The map went live today, 10th of July...

Click on a circle to bring up a range of graphs for each river showing ranges and the current levels.
Very nicely presented and very useful too.