Stan
You say you think it is the size of a wasp, however all the photos I find of this moth say it is large?
The picture you submitted looks like the privet hawk moth.
Privet Hawk-moth
Wingspan 90-120 mm.
Noted as Britain's largest hawk-moth, which is found in the southern half of Britain, and has distinctive pink and black barring on the body.
It is found in woodland and suburban habitats, and flies in June and July, with a single generation.
The large caterpillar is green with purple and white stripes along the side, and a black 'horn' at the rear. It feeds on privet , lilac and ash.
Here is what wikipedia says
http://en.wikipedia.org/wiki/Privet_hawkmoth
