Where is the Devil's Gateway in Cornwall?

Answer 1

Oh, dude, the Devil's Gateway in Cornwall is actually a rock formation located near Tintagel Castle. It's said to be a natural arch formed by the sea eroding the coastline. So, yeah, if you're looking for a cool spot to check out some wicked geology, that's the place to go.

Answer 2

No such place, but made up for the TV show 'Wycliffe'.

They probably used scenes based around local Standing stones, otherwise known as menhirs, which are more abundant in the West Penwith area of Cornwall or perhaps even The Nine Maidens stone circle, St Columb near Wadebridge. The stones used as menhirs were often carefully chosen, their shapes having meanings as well as being visually striking: pillars, slender triangles or stones with pointed tops.

Info found at http://www.historic-cornwall.org.uk/flyingpast/stone.html