I got terrribly excited when I saw this as I thought it might be a glow worm predating a snail - so I have lots of other photos! Looking on the intertubes, I now doubt that, but what is it? Some kind of ground beetle larva?

 

One of the ground beetle larvae?

 

looks like a woodlouse to me - there are 35 species in the UK says Google.

 

Too many plates and not enough legs to be a woodlouse/slater. I'm sticking with common ground beetle larva.

 

With the number of pics I took, I've probably got some of it's arse end, if that would help?

 

Not a glow worm but a ground beetle or carrion beetle larva nicely shot btw Adrian

 

at: http://www.downgardenservices.org.uk/groundbt.htm there's a similar picture of a ground beetle larva eating a slug.

 

Thanks Alf, this was one of my geriatric lenses again!