Same story at the airport I work in (which is not EDI).
Confirmed Wheelchair bookings go unmet, or have passengers waiting for ages for a pick up, often in excess of an hour.
Trying to get a wheelchair to come and meet a PRM at a check in desk is an impossible task, again, 45 minutes is an average wait time, they are always sent down to the central area at the other end of the building. High Lift machines are nowhere to be found when they are needed, God help us when a flight goes off jetty unexpectedly.
Again, many, many complaints have been made by passengers, crew and airlines but not a single thing has been done, if anything, it's gotten worse, this Christmas was horrendous. Of all the services provided, this is one you'd think would never be short staffed or under equipped, but it is!