Found in apple tree, put back rather quickly.
No interactions present.
Forgot to add that there is no yellow turbicles below the horn which suggests Eyed Hawk-moth.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Sphinx has more distinct sometimes whitey red banding on the caterpillar
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Thankyou for your identification.
Lat/Lng: 51.9, 0.1
OS grid ref: TL4734