How about this one

[brizospark]

OK working in a factory at the moment and the wiring is diabolical

Here's one anecdote-

Lighting circuit - lights are on

Take fuse out - lights go out
Fuse in, neutral disconnected - lights go out
fuse out, neutral disconnected - lights on

Work that one out

 

[brizospark]

thanks for all suggestions, am due to check this out again this week so will keep yous posted