I have a couple of questions about the pass bus....
Does an operator have to accept the bus pass?
Could an operator decide to charge the passengers the difference between what they get and the actual fare?
Some research ...
English National Bus SchemeThe scheme entitles all older and most disabled freedom pass holders to free travel on local bus services in England outside London between 9.30am and 11.00pm Monday to Fridays and all day at weekends and on public holidays
What is the definition of a 'local' bus?The definition of a 'local bus' will be self-evident in most cases, but in a few instances could include some longer distance buses and coach services where part of their route is registered as a local bus service.
Run a local bus service - Overview* A local bus service uses public service vehicles (PSVs) to carry passengers who pay separately over short distances.
* The route can be any length, as long as passengers can get off within 15 miles of where they got on.
* With a few exceptions local services operating outside London must be registered with the local traffic commissioner.
ExemptionsYou don^t have to register a bus service if all of the following apply:
* someone other than you or your agent is responsible for arranging the journey and bringing the passengers together
* the journey is not advertised in advance to the general public
* all passengers travel together to or from the same place - eg a school or factory
* passengers pay the same fare no matter how far they travel
nor do you have to register ...
* a replacement bus service - when a train service is temporarily cancelled and a bus is used instead
* excursions or tours - as long as they operate less than once a week
I believe that any local bus service registered with the traffic commissioners must accept and English National Bus Scheme pass as full payment for journeys made by the holder within the times mentioned above, but I haven't found the "smoking gun" URL that states that. The above has been sourced from:http://www.bromley.gov.uk/info/200022/help_with_transport/107/freedom_passes_for_older_people/4https://www.gov.uk/run-local-bus-service/overviewhttp://www.dft.gov.uk/vosa/repository/Application%20to%20Register%20a%20Bus%20Service%20-%20PSV%20350.pdf
Edit to add two more quotes - which (to me) imply an obligation on bus operators of local buses to accept passes as full "payment" for fares ... my use of colour to highlight significant words in the context of the question.
Why can^t I travel 24 hours a day with my disabled pass outside London as I can in London?The English national bus scheme only
obliges local transport authorities to offer off-peak travel on local buses between 9.30am to 11.00pm. Any travel outside these times is considered as a local benefit and is funded at the discretion of the local authority. Generally, most local authorities will only offer local benefits to their own residents.
Q. What is the ENCTS▸ (English National Concessionary Travel Scheme) and when did it start?A. The scheme started on 1 April 2008 and all older and most disabled freedom pass holders
are entitled to free travel on local bus services in England outside London between 9.30am and 11.00pm Monday to Friday and all day at weekends and on public holidays
http://www.richmond.gov.uk/home/health_and_social_care/disabled_persons_freedom_pass_scheme/english_national_bus_scheme.htmhttp://www.londoncouncils.gov.uk:80/services/freedompass/faqs/nationalscheme.htm