Yes i believe they are Stage Coach, don't really use them myself though.
I was amazed that the driver had no perception of what would happen to the wheelchair user who was expected to get off the bus WITHOUT the ramp down. The step down was far too high and the wheelchair and it's occupant would have pitched forward had I not intervened. The bus driver then said to wheelchair user 'I will help you down' as they took hold of the back handels on the wheelchair. I pointed out the wheelchair was heavy. I hadn't a clue what they were proposing to do?
Driver then fetched the portable ramp and put it down for wheelchair user to exit bus!! This last option took all of two minutes!
I know for a fact that taxi's who carry wheelchair users have to adhere by health and safety rules --- so what is the difference for the bus drivers?? 
Anyone???
Sounds like the bus driver should have took control of the situation.
Most bus stops have raised kerbs, and the buses can lower the front suspension at bus stops, which usually means that the floor of the bus, and the kerb are virtally flush.
Usually the wheelchair user (who will be familiar with the stop) will know if the ramp is required or not so he will ask the driver to deploy it. The ramp is not automatically deployed therefore for every wheelchair user. Most times its not needed. I have yet to see a wheelchair user exit a bus with a perilously large drop.
All Stagecoach drivers are currently receiving training (mandatory) to receive a Certificate in Professional Competency, which amongst other things covers the Disability Discrimination Act.
As I said, the bus driver should have took control of the situation before you did, but, because you did, he probably thought there was no further assistance required, or maybe you were travelling together.
I know its not a nice thing to say, but if we were to jump out of the cab and deploy the ramp for each WU irrespective of whether they needed it or not, we would undoubtedly receive a verbal dressing down, because we would be disrespectful in assuming that they can't manage. Do you see what I mean - its a tricky area sometimes. In fact its a wonder your intervention albeit with the best intention, wasnt perceived in this way.