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Dave, that looks convincing to me, but I'm not familiar enough with this species to be certain enough to click "I agree"! As you may know, Garden Dart has become quite a rare moth in recent years, but I can't see any reason for this to be anything else.
Have you reported it to your county moth recorder, would be interested to hear their views:
Entomologist and biological recorder
Lat/Lng: 52.588, -0.22
OS grid ref: TF206003
In my garden.