I have only seen Sea Slaters a couple of times on the foreshore at Rainham. These huge coastal relatives of the Woodlouse are positively prehistoric when you get up close, with beady eyes, waving antenna and articulated armour.
The latest record came this morning in a photo from Dave McGough of the Wheatear (which was still around yesterday). I would imagine that it would have taken a bit of bashing before it was able to eat it!
23-3-13
Looks like a mini crab ! Great Pictures Dave