About a centimetre long with rounded grey wings. This individual took off before I could get a decent photo!
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I only saw this species for the first time myself on exactly the same date as yours! Mine kept waving its antennae up and down at a furious pace.
Entomologist and biological recorder
That's a fascinating coincidence, Martin! Thanks so much for your help - it certainly looks good for that moth having looked at the pictures. Really appreciate your help.
...and it looks like there's only been a couple of confirmed records on the IOW!
Lat/Lng: 50.6857, -1.5262
OS grid ref: SZ335874