Though it's a flat fare system for most routes, and the fares are shown above the timetable at every stop (unless the timetable has been vandalised or stolen, obviously).
Not to mention the fares are nice, simple numbers. £1.50 single, £4 all day. No return ticket unfortunately.
To compare First Aberdeen - you pay a fare dependent on the number of zones you travel through. The information on where zones are is not in the public domain, and it appears that drivers are unsure as well as my fare varied from £1.85 to £2.25 (IIRC - exact numbers may vary). You often simply don't have change for these seemingly random prices, which the conspiracy theorist in me sees as an intentional ploy...
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We had this discussion once when I worked for a national book retailers. I have no reason to doubt my former manager - because I would believe that she looked it up - but it is second hand information. Working in SE England, it was often said that counterfeiters used to favour Scottish notes the further south you go simply because shop assistants are not aware of what they are looking at and checking for. Indeed, during my time a number of other shops in the shopping centre (but not us as far as I know) had notes rejected by the banks for that very reason.
A bank will not reject a legitimate Scottish or NI note. They will reject counterfeits - retailers should take the same steps checking these notes as they do English notes and any fakes will be obvious. Cash handlers should also accept them without additional charges - I'd be concerned that I wasn't getting the best deal from them if they were.
*If* that is correct, then in this case, the driver is at will to refuse what he likes (within the company's Conditions of Carriage, etc.) unless the journey has been completed.
Legally, he can refuse (or accept) any form of payment. A transaction is essentially an agreement between the vendor and the customer - the vendor provides goods or services (in this case, travel on a bus) in return for a mutually agreed payment (in this case, cash). Retailers need not accept Scottish notes. They need not accept English notes. They can sell their goods for West African Francs, or sheep, or even a jaunty dance number if they so choose (although I can't imagine any of these being a sensible business decision).
First Bus seemingly have a policy, however, whereby Scottish notes are accepted. Therefore, refusing such a payment would be perfectly legal but would also go against your employers' rules - in this case, whatever actually happened, First Bus have got some negative publicity as a result.
Again, I emphasise that the exact story here is
very unclear, and talk about acceptance of commercial banknotes is not necessarily relevant to what happened.