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I think your moth is a Poplar Hawk-moth Laothoe populi. There is a very similar picture to your specimen, although "upside-down" here:
Yes, this is a Poplar Hawk, Lathoe populi, probably the commonest Hawk Moth in the UK, and out pretty much all year from March-September. Lime Hawks are a lot greener, a bit smaller, and don't have the reddish patches on the hindwings that can be seen in this photo. They are a very similar shape though, and in fact are quite closely related - the two species can interbreed, although the hybrids are infertile.
Record your ladybird sightings!
Thanks for that peoples was'nt quite sure.
Lat/Lng: 52.715713353038, 1.687624186261
OS grid ref: TG491194