No identification made yet.
No interactions present.
These are the eggs: http://www.flickr.com/photos/39361502@N07/5033071962
They do look more like insects than slugs to me, and I think rockwolf's suggestion is a good one.
Entomologist and biological recorder
Lat/Lng: 51.4053, -0.1889
OS grid ref: TQ260689