Re: Fail of fails.
In the UK librarians (as opposed to volunteers) are increasingly rare in libraries, there will be IT staff in the central office who will nominally be looking after the IT infrastructure, I wouldn't be at all surprised if the Wifi was subcontracted out to a third party to operate, probably with some form of unlimitted/Gigabytes plan. A single person connecting from a long way away is not going to add any traffic spikes above what a single additional person connecting locally will do. The contractor won't care even if they did as they aren't spending their own money to monitor it. The wifi will no more be watched over than the taps are watched over by an onsite plumber...