Hiya,
Thanks for the replies and sorry about my stupidly delayed reply but been super busy lately.
I'm afraid that diagram is a little confusing as mine only has 3 screws not six, and I'm not sure what the white bits are (power or the powered devices?).
As for Chagrin's reply it makes more sense to me, but just wanted to check that you would have the live in one screw and live out the other and its just a case of having a switch in the wire as such? Also does this mean that if the terminal is open when off, it's closed when on and vice versa?
Thanks again!