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If privet or lilac is growing near to where you found it, this would help with the ID as they are the two most common foodplants of Privet Hawk-moth.
The purple and white flashes combined with the dark horn are diagnostic of Privet Hawk
Record your ladybird sightings!
I agree that it's a Privet Hawk-moth. I reared one of them. As Vinny says, it looks like it's ready to pupate.
Lat/Lng: 51.208712143865, 1.2616950273514
OS grid ref: TR279505
On rough grass in the small back garden of a semi on an estate. No woodland in the vicinity.