Apparently this was taken in North Wales

It ain't. It's a grass snake and slowworms.

Slowworms, why does it have to be slowworms isn't as catchy tho.

we had an adder in the garden last year ( doesnt say much for our gardening).

Signs all over the grassy dunes near here warning people not to let dogs off the lead or stray into the grass too deep due to snakes in the summer.  Yet I always used to see idiot tourists letting their beloved pets roam free.  Morons.