ID please!!!

ID please!!!

Observation - ID please!!! - UK and Ireland. Description: Weird creature flopping its way across the towpath. Quite large - 5 or 6cm long. Looks like it may be more at home in water? Some kind of nymph? (Tried to add an animated GIF to show its movement - hope it works.)

Weird creature flopping its way across the towpath. Quite large - 5 or 6cm long. Looks like it may be more at home in water? Some kind of nymph? (Tried to add an animated GIF to show its movement - hope it works.)