When I was tidying up after trimming a tree in the front garden I found this. I've absolutely no idea what it is!
It was about four inches long, no real facial feature (it seemed to be leading with a wierd sucker on the left It has a strange point/tail very similar to a slugs sensors. The tree was a willow and had been significantly eaten away.
I'm not sure if it is part of the caterpillar or slug family. Any help woiuld be great!!