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I suggest a mole cricket.Though they actually have 6 legs, the front two look like pinchers. They eat roots so are baddies, except I think they are extremely rare near extinction. I think if you find one there is someone somewhere who desperately wants to know about it.
. . . . It was about 1 1/2 inches long, just under 1/4 inch wide, shiny black but with muscle bands (if that makes sense) all the way down. Its belly was whitish grey and it had 4 legs to the front. When I first dug it up, I swear the thing panicked. It seemed to look up at me then did a dive that would shame a professional diver into the soil and was gone. . . .
Did you look at the pictures in that link I posted XX Jeannine
What about this onehttp://www.wsbrc.org.uk/mI5TDHfcvUa_ZuU9VnbQSQ%3D%3D/Species.aspxI am rather confused about the four legs, perhaps a baby pipistrelle bat maybe its mother dropped it.
I have had another thought what about a newt. The baby ones are very small at the moment. No antenaeThere are huge woodlouse called sea slaters which live on seaweed but they have 6 legs. I thought you were in Swindon, the tide went out many millennium ago. I remember going to the youth hostel in Boscastle and they were in the ladies showers. Your should have heard the screams.Maybe some kind of cockroach. People are coming to Swindon from around the world and bringing their pests with them. But some people keep them as pets. Have a look at the hissing cockroach.http://www.swindonadvertiser.co.uk/news/1176591.print/