There are three British snakes, but none is beige.
Adder, now quite scarce, has V-shaped mark on head, and zig-zag line down back. Poisonous -- very painful, but not dangerous bite. Eats small mammals.
Grass snake has small black marks down side, a black collar, and (usually) also a yellow or white collar. Not poisonous, eats frogs etc.
Smooth snake is found only on or near heathland, and is brownish, with many small black markings and a crown mark on the head. Not poisonous. Eats other reptiles, especially the even rarer sand lizard.
Slow-worm is a legless lizard, bronze or beige. It's very smooth, often with lengthways stripes, with a lizard's head, including eyes with eyelids. Tiny teeth, small mouth, not poisonous. Eats small insects, slugs etc.
All have the forked tongue.