JodiesMummy - do you not understand that you would be discriminating against someone, because whilst you and your child are in the disabled loo, someone who really needs it because of their disability or condition might come along.
If, for example, there was a queue in the Ladies, and I had one of my sudden, unexpected bouts of torrential diarrhoea, you and your dc might come out of the disabled loo to find that because I couldn't get to the loo in time, I have soiled myself, and not just a bit in my knickers, but it would be everywhere, and I would be in tears, beside myself with mortification and embarrassment. Or Pag's ds might be having a total meltdown because you were using the loo. I bet you'd rush past us both, doing your best to ignore the trouble you'd caused.
And you could have avoided causing all this upset and grief just by being willing to queue for the loo for a few minutes.
How hard is it to understand that facilities like these for the disabled are few and far between, and have been hard-fought-for. You can queue with your child, and there's nothing stopping you using the ordinary loos - so why on earth do you feel this huge sense of entitlement to use something that you don't need but someone else may well do??
Go and read some of Riven's posts about the difficulties of living with a disabled child. She hasn't been able to take her child out and about on visits to museums, theme parks, attractions etc during the holidays, because if her dd needs changing, she CANNOT change her without going home (which, as someone has said, may mean waiting for three different buses, because the driver won't put the ramp down, or the bus isn't accessible, or some entitled mum has her buggy in the wheelchair space and refuses to collapse it.
Look at some of the stories on this thread, and then ask yourself if your conscience will let you risk making their lives any harder.