1.5cm in length.
No interactions present.
I agree that the caddis is a Leptoceridae.
However the title of the post suggests that you're looking at the mayfly not the caddis? The mayfly is from the genus Baetis.
Thanks, my fault, very tired when I was posting these. I was indeed looking at the caddis but must have been distracted!
Lat/Lng: 51.4413, -2.5946
OS grid ref: ST587715
Fast flowing, rocky, shallow river (the Malago) about 1 foot deep.