In a pool on bare peat formed by clearance of bracken and birch two years ago
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These are really tricky things to ID (at least, they are to me, but I've only recently started working on gerrids), but I think you're right. At least, all the features I can see appear to be right... but some of them, like the lack of a ventral tubercle between the hind coxae, are difficult to confirm.
Lat/Lng: 53.43351, -2.47631
OS grid ref: SJ684930