What caterpillar?

Found on concrete down by the dustbin - and a long way from vegetation of any kind - one lime-green caterpillar. Actually, lime green doesn't cover it. More a late 1980s electro-pop fluorescent green.

A quick trawl through the ID sites Google has to offer and my best guess is that it is a Speckled Wood (Parage aegeria), although I'd be interested to hear otherwise.

Photo: Franz Xaver

It does makes sense that it could be because we did have lots of speckled woods around last summer. I sent my find on its way in some grass at the base of the hedge, a better bet I think than the dustbin.