Hey Elise,
Thanks so much for getting back to me and so quickly!
So I managed to fault find and sort out a couple of problems with the plugs. There was a bent pin in one (which is probably why it was so hard to get it to click shut in the first instance), and there was also a positive wire in one of the plugs that didn’t correspond with the positive wire from the other plug. Once I bent the pin back into a neutral position, and move the wire over to the correct position, it all worked a dream!
Thanks again for your reply, and for the info on your instagram and Facebook feeds. I’ll definitely check them out and DM you if something else comes up 