I did a pond dip at Pennington Flash nature reserve and found one area with 'clean pond' invertebrates and one with 'low health' pond invertebrates.
No interactions present.
Your observations do not have photos attached. Do you have any photos to help confirm ID?
Lat/Lng: 53.49158, -2.55688
OS grid ref: SJ631995
this was found in the pond by the car park rather than in the main lake