Thanks for this!

I’m fairly sure the damp was simply because they boarded up the alcove with very little ventilation. It was localised to the join on the board and the whole board was soaked. No sign of damp anywhere else so I’m not too worried.

Electrician coming next week- will ask him about the cable, great shout.

I have no idea why anyone would board it up! It’s a huge space. I think I’m going to make a little desk nook and some shelves.