Whoopydo - interesting that you picked one word from my post to comment on, and utterly ignored the rest of it.
As I said, the difference between an able-bodied mum with a buggy, and a disabled person is that the disabled person needs to use the disabled loo - and it is the only loo that is definitely set up to meet their needs, whereas the mum with the buggy and the children wants to use it, and there are other toilets available for her needs.
Whilst that mum is using the disabled loo, a person with continence issues could be soiling themselves outside because they cannot wait and cannot use the ordinary loos - is that acceptable? Or an epileptic person, such as ApocalypseCheeseToastie's neice might be having a fit in a cubicle in the ladies' loos, and coming to harm because there isn't room there to catch her and keep her safe if she has a fit - is that OK, because she, and her parents/family 'should have a bit of understanding' for the needs of the able-bodied mum?
How would you comfort me if I had a sudden attack of torrential IBS diarrhoea, dashed for the disabled loo because there was a huge queue in the ladies' loos, and found it occupied by the able-bodied young mum with her buggy, and as a result I couldn't get to the loo in time, and suffered my attack of diarrhoea standing outside the loo? Thank god that has never happened to me, but it has been a damned close thing on occasions - I have reached the loo literally at the last possible second before the explosion occurred. Had I had to wait, I would not have been able to hold on - it is like being kicked in the stomach, there is nothing you can do. If that happened to me, how understanding should I be of the ablebodied mum?