come on @Harry Bloomfield it's only simple if you know it pal! Not all of us on this DIY forum are seasoned pros like you
This method has been appreciably simpler for me to comprehend and following in comparison to using the earth cable.
I think the point is that if you are struggling to follow and understand such a basic concept as this, then should you really be messing about with wiring at all?
[EDIT] John I wrote that, whilst you were responding. It does seem we have similar concerns about the OP's ability and safety.