Want to put £5 on it?

Is it in a conduit, or buried? Not sure if begin under water would slow it down. Could it have been kinked / damaged? If you can, pull it and test. - for a job like that, run double for future proofing.

When I started there was lots of smoke 😀 it’s true that you can easily accumulate random stuff, but I still think it’s better to have spares of the things I use than risking running out and waiting for a delivery. Maybe I’m just disorganised.

When you buy components, buy a bag of them. Good for when you let the smoke out of one, and you can have several projects on the go at a time.