Confidence: I'm as sure as I can be.
Notes: This caddisfly hatches in great numbers from late may to mid June. It is approx 3cm in length. It would be great if it were possible to get the species from this image, or at least to narrow it down. This is from a small upland lake which is spring fed and so isnt as acidic as neighbouring rain fed bodies of water, I think the exuviae attached also could well belong to this species of caddisfly, its the most prolific one at this water. Dates are correct, just coincidence that they are 1 year apart. Same water.