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Nice!! I think that this is an immature male or female Lesser Emperor (Anax parthenope), see https://british-dragonflies.org.uk/species/lesser-emperor/. It's a scarce annual migrant from Europe, first recorded in the mid-1990s. I've never seen one and I think most would consider them as still quite rare, so lucky you! If you were so inclined, you could consider entering the sighting on iRecord or iNaturalist as it all helps to build a picture of the changing status of UK fauna.
In the garden today