I know it's not the sort of thing you want to remember, but did you take pictures? If there is any sort of dispute with the guy or his insurer later, pictures might be helpful.
I took a picture of the windscreen after the pipe had been removed (because he had it out before I could go inside to get my phone) as husband was thinking exactly that: if this guy wants to wriggle out of it, we need photos. He said he got the photos of the pipe in the car.
They've cancelled the job for the day as their priority now is to make sure the car and garage get sorted. He said they are insured for up to £5k so that should be good enough! Husband just wants to make sure they'll include the scratched paint and not try to get out of it. The guy was being helpful trying to vacuum up the bits inside so I doubt he'll get much for scratched seats, but we'll see. Rik said they've already emailed about it with claim number and he won't be letting his insurance company know because it's not a car accident. They seem to be a genuinely good family run business who made a mistake, feel bad, and are trying to rectify it. We didn't give them a hard time about it even though it majorly sucks because everybody makes mistakes and this guy isn't exactly going to get off without learning his mistake.
Please tell me he took photos of the damage before and after the cleanup? I'd make sure you have pictures of everything. Definitely not what you needed when you are going to show the house!
Asbestos is scary, but I'm not sure how common the incredibly dangerous type is over here - its not usually in plaster. If it was asbestos, they definitely should have wet it down before trying to clean it up. There are usually very specific handling procedures when asbestos could be involved, and a pipe fitter should definitely know them. If he just wiped/vacuumed then he could've exposed himself and you guys to more.
We only got photos of the windscreen but the pipe had already been removed by the time I could get to it. I mean, you can 100% tell it was a round pipe in there as the whole is a big, round size matching the hole in the roof and they've already started the claim process so hopefully we don't have to battle over this. Thankfully it's a separate garage and not part of the house. It wasn't plastered or anything and we can have the estate agents explain that this roof will be fixed (and, possible, completely new) soon. If this was part of the actual house itself, I would probably cry. They were nice enough and put a tarp on the roof to for us to protect the garage (which they didn't necessarily HAVE to do, but it was nice they chose to do it).
Effectively, they still have to come back and finish off the piping next week AND we need to sort out the garage/car damage so they've actually left with LESS accomplished for us today vs more...when it rains it pours...though I can't complain as it could be so much worse.