I'm unsure why, but reply #3 (above) didn't appear on my screen until I'd posted reply #4
Firstly - thanks for the reply, but just to confirm; the appliance is plugged into the ring main as normal, then what I would call the 'Live' core goes into the 'common' on the relay, and out of either the NC or NO (dependent on requirements) on the relay, then onward to the pump?
Ok - I get that - so the relay is acting literally like a switch in a lighting circuit - thanks
Secondly - I appreciate the advice, I really do, but I'm a bit disappointed in the 'if you have to ask', or 'if you don't know what you're doing - don't do it' comments.
I know about mains wiring, but I dont know about relay connections - in any case, I would estimate that over 95% of intitial posts on this site are requests for advice regarding problems that posters are struggling to solve - are you really suggesting that they 'shouldnt ask'?
Final comment; disappointed, but grateful (weedpharma) for your advice