Thin dark green caterpillar with a light brown head. Very fast and lively.
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I'm not sure what size it was but I found it in a bowl of fruit from my garden. In the picture it is on some lettuce but as it showed no interest in it I decided to put it back outside so I never found out what it was, but thank you for your comment!
Not sure I am going to get any further. If you can list the fruits that were in the bowl that might help track it down but I'd not guarantee it.
peaches, blueberries and other berries I think. Thank you for commenting :)
Lat/Lng: 51.5, -0.2
OS grid ref: TQ3080