Just been looking at your Calderdale blog.....found it from your recent post about Garden Darts on the Yorkshiremoths group.
On the July page I noticed the following blog by Chris : "Also found a number of these caterpillars in the garden this afternoon, does anyone know what they might be? (middle)". I think that this is a Campion larva. Please could you let Chris know as there are no contact details for him.
By the way, I'm also the VC63 dragonfly recorder for the British Dragonfly Society and would appreciate any records you have. Hope you don't mind but I've attached a recording form for your use...if you you're willing to pass them on.
if any one wants a recording form please send me an e-mail and I will forward you one.