Earlier quoted context omitted.
It probably isn't, but it's in that annoyingly small fee zone where it costs more to take them to court than it does to just accept the fine. I think in this case, they'll probably get the money back from their CC company though.
In England they could go through small claims. An online claim for £100 would cost £25 initially and costs can be recovered. https://www.gov.uk/make-court-claim-for-money/overview They could get free legal advice from Citizen's Advice. http://www.adviceguide.org.uk/wales/law_w/law_legal_system_e... But just reclaiming the money via credit card companies is probably easier. I'm curious about why the people leaving one…
These kind of petty fines really annoy me, far more than a lot of major crimes, because people know exactly what they're doing when they pick a low amount - and they expect to get away with it. You see them all over the place, eg. change your ISP and they'll fine you £50 for not returning a £10 junk router that you have to return, instead of them picking it up.
The money is in an annoying zone where you are put off filing a claim because of the potential cost, not just in money but in time as well. You might still need to go to court over your small claim, which will take up a day and a lot of hassle, etc.
It's one of the reasons that parking tickets are only £30. You could contest them, but it's costing more in terms of your time than you'll recover monetarily, even if you prove the ticket invalid. Likewise with automated speeding tickets from cameras - you could contest it, but it's just too difficult for most people to be worth the risk. Whereas in countries like Switzerland or Finland, where they can have huge fines, I imagine they have a lot more court cases...