What's going on here?

[RazzyRascal]

You couldn't be more wrong.

Yes, quite, at 3:49pm before I'd spent the evening discussing on this thread with the other more helpful chaps (and swotting up myself) I was most certainly wrong.

 

[RazzyRascal]

I think you have two choices here, as advised by others.

You can take out the wiring linking the passive to the coach lantern and replace the CL with a fitting that has a built-in passive.

Or replace the passive with a new one and its supply cable with black 4 core flex.

And it would be good to have a DP isolating switch indoors to switch it off in case of water ingress.

Thanks Securespark, I opted for the latter, albeit minus the isolating switch which I will attempt to rectify next time we have a spark over.

All functioning as required now.

Thanks for your assistance everyone, it's really decent of you all to help guide me to a safe and satisfactory conclusion.

Until next time!