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:
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The Public Service Vehicles (Conduct of Drivers, Inspectors, Conductors and Passengers) (Amendment) Regulations 2002: www.legislatio...
Department for Transport email regarding the Regulation and seats in coach wheelchair spaces: www.whatdothey...
The Public Passenger Vehicles Act 1981 section 24:
www.legislatio...
Police Crime Commissioner email regarding bus drivers refusing wheelchair users:
www.kingqueen....
The Public Service Vehicle Accessibility Regulations schedule 1 section 3:
www.legislation...
National Express Wheelchair User Guidelines:
www.nationalex...
NMI Magic Seat:
www.nmisafety....
Megabus Conditions of Carriage:
uk.megabus.com...