The photograph is not very good, but I will attempt to get a better one, using a longer lens with macro.
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Common Darter Dragonfly is the most likely identification, although I'm not fully convinced that Ruddy Darter can be ruled out (which is no doubt why Michael left the certainty level at "It's likely to be this").
Lat/Lng: 50.722996220075, -1.8482301401505
OS grid ref: SZ108914
a small pond in the public gardens stocked with fish, fed by (usually) water piped over a mini waterfall