I can't see why everyone gets worked up. ID is what it says: an IMMEDIATE danger. I have never had a punter refuse a cut off, when explained calmly and properly (and while I am at it, there is no need to start saying "you are lucky you weren't dead/blown up/poisoned etc). If they do refuse, explain you have to follow a process which will culminate in NG cutting off the supply to the house, followed by the cost pf reinstatement.
For AR, label and notice properly, and turn off at isolation switch. Explain the relevant seriousness of the particular situation and possible repercussions - and tell them how you have isolated. It is no big secret. Then it is up to them, and you are covered.
If it is dealt with professionally, you will probably get the followup work. If you want it.
Personally, I would be mightily ****ed off if my aged Aunt was left freezing over the weekend 'cos someone overstepped their remit.