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Looks like a mealybug to me. Not a creature I know much about, but there's info at:
Entomologist and biological recorder
You will have forgotten this Mick..
A pity the ID panel didn't form. See my ID here http://www.ispotnature.org/node/741725 which gets the post out of the doldrums.
I have offered it here but it requires a few to shift agreements to make it Likely.
Lat/Lng: 51.3, -0.3
OS grid ref: TQ2364