The downspout not sure - could just have been thermal movement, It was only supposed to be a temporary fix when I put it up there about 10 years ago. I've not been paying much attention to the upkeep of house lately.
It didn't fix the problem though and I was still getting water leaking in, all be it not pouring in like before.
I've torn the ceiling down and there a about half a dozen rips in the roofing felt where it was coming in. At least now I can get buckets under them, I've disconnected the soggy electrical stuff from the kitchen circuits so I can put the kettle on and make the much needed coffee I was on my way to do when I found the leak.
I did try the gorilla tape I have over them but it wont stick whilst things are wet, despite it's claims. I might have to get some of that self adhesive flashing tape instead.
Hopefully no damage to the boiler but I won't be able to tell until I power it back up, which I'm not doing until it's dried out fully. The rest of the damage is all cosmetic and fixable, just annoying as I'd much rather not at the moment and knowing me I won't bother, ceiling are overrated anyway.