Wheelchair access to Coaches: booking not necessary (Megabus)

It is a criminal offence for a driver of a wheelchair accessible scheduled coach to refuse a wheelchair user access to a wheelchair space, even if the wheelchair user hasn't pre-booked and there's a seat installed in the wheelchair space.
But Megabus don't recognise this.
Links:
------
The Public Service Vehicles (Conduct of Drivers, Inspectors, Conductors and Passengers) (Amendment) Regulations 2002: www.legislation.gov.uk/uksi/2...
Department for Transport email regarding the Regulation and seats in coach wheelchair spaces: www.whatdotheyknow.com/reques...
The Public Passenger Vehicles Act 1981 section 24:
www.legislation.gov.uk/ukpga/...
Police Crime Commissioner email regarding bus drivers refusing wheelchair users:
www.kingqueen.org.uk/west-yor...
The Public Service Vehicle Accessibility Regulations schedule 1 section 3:
www.legislation.gov.uk/uksi/20...
National Express Wheelchair User Guidelines:
www.nationalexpress.com/en/he...
NMI Magic Seat:
www.nmisafety.com/product/mag...
Megabus Conditions of Carriage:
uk.megabus.com/conditions/con...