We went to a large aquarium centre today for DC2’s birthday. It was very busy with many families enjoying the centre. We had a great day out 
As I am in a wheelchair, I have no choice in which bathroom I can use, I had to use the disabled toilet.
I had to wait until a mother and a couple of younger kids came out of the disabled toilet which surprised me. As it looked unlikely that any of the younger kids would need nappies.
Then I went in this was a dedicated disabled (not accessible) toilet with no baby change facilities! I do understand that the first mother might have an invisible disability, as might her children. So thought no more on it.
All the time I was in, the door handle was being rattled and I kept calling out that the toilet was occupied, which was frustrating.
When I left and an impatient mother with a pram was waiting to go in. I told her that there was no nappy changing facilities in that toilet, assuming she wanting to change the baby. But she snapped at me that she was a mother and had to use this toilet gesturing to the pram.
I felt that this second mother was just entitled and rude. Having a pram doesn’t entitle you to use a disabled toilet. Use the end toilet in the women’s bathroom, with the door open and the pram in the toilet doorway, like everyone else does.
Years ago, I had 4 kids under 6yo at one stage and I never used the disability toilets, except for the baby changing ones for baby changing purposes.
Therefore, AIBU to have asked the aquarium centre to add a radar lock to the bathroom. AS this was the ONLY disabled toilet, and the baby change facilities were separate. To increase the likelihood of ringfencing these limited facilities for those who actually need them, rather than those people who want to use them.