Er ....... the last link just above, about Lethbridge, is mostly fine. Except that, where it mentions the Nigel Kneale connection, it's actually wrong, and unfortunately that was the whole point!
So, for the sake of accuracy (not that anyone pays much attention to my huge rantings) ........
What Lethbridge sorta claimed was, he could detect different materials by dowsing, as they all have "characteristic frequencies". Furthermore, that he could also detect different emotions, and even further, that these various emotions were "linked" to particular materials!
So, for example, near a stream or tree you would feel "calm and relaxed", that being their "emotion" (an attractive theory, who hasn't felt the calming influence of running water?). Furthermore, that some materials - eg, perhaps the stone in houses - might even be able to "register" emotions .... the Stone Tape!
However, the idea of Ley Lines - lines of force connecting "power centers" (usually stone circles) - as referred to in the 1979 Quatermass, is a completely different one, and comes from a book called The Old Straight Track (and NOT Lethbridge, as claimed in above link!).
http://www.answers.com/topic/the-old-straight-track .
As far as I know, one day Watkins simply "noticed" (sceptics would say "invented") these lines, somewhere around 1920, much earlier than Lethbridge was doing his own stuff. As far as I know, Lethbridge never even once mentioned Ley Lines, and in any case, he certainly didn't invent them!
Which takes us a very long way from Radio Times error, in non Sky HD .....