but my point was that people may not seek to book assistance at all because the message has been given that there is no access for wheelchairs. Why not just make the position clear on the posters? People might even be led to think that TOCs are trying to aboud the problem and cost!As explained in the OP, that may be, but its the fact this its often not publicised and the impression simply given that wheelchair users can't be carried that is the problem.
But when the person books the assistance they will straight away be informed it is possible.