"Not enough transit wheelchairs!"

I have an elderly parent who is not too good on her feet and therefore needs to use a wheelchair for distances more than say 50 metres, the distance from a car park to the hospital reception for example. On the last couple of occasions on visiting NMGH, I've found it damn near impossible to find a hospital chair to ferry her to and from the car. Could the management bear this in mind and provide more chairs please in all locations throughout the hospital? I notice that I'm not the only person to broach this subject.

Many thanks!