Confidence: It might be this.
Notes: I've looked and looked at these images and still can't make my mind up. The female has a very "thick" appearance suggesting dryas and both sexes have short, thick pterostigmata, again suggesting dryas. Unfortunately, the detail on segment 2 and anal appendages of the male are not clear. These would have made positive ID possible. Although very restricted in range in UK, I think the area where this photograph was taken falls within its range.