Afternoon Neil,
I believe this image is yours -
rove or ground beetle larva on Flickr - Photo Sharing! - did you get an answer in the end?
If not - it's a Carabid larva. Staphylinids have one tarsal claw, and Carabids' two as it seems to have in your image. A nice tip for separating these common under-log/decking-type insects that I picked up from the 'Net today!
I'm glad the meet went well.
Take care,
Jason