No probs and cheers Lee....

I'm just reading up on safety strategys so I can see how many relay connections I need etc. Struggling to get my head round it, think I need to lock myself away from all distractions to get my head round it

OK another question, I presume the proxy switches to get are PNP NC ones (sods law as I have a good selection of used and new NPN NO ones that somehow didn't get left behind at my previous job!!)