It could well be a smooth (common) newt (trituris vulgaris), although you may want to compare with palmate newt (Lissotriton helveticus) too.
Both can spend extended periods out of water - they tend only to frequent ponds to breed iirc. So I guess they can wander far looking for food.
There is some good ifo on wikipedia. Note that all species of newt are protected in this country - which means even picking them up for photos could be an infringement.......
Nice picture, though.