HouseBaelish - yes please to a long mirror that suits both those standing and in a wheelchair. I'm usually in a wheelchair, but sometimes I leave it outside if I'm feeling up to taking a few steps in and don't have the energy for the hassle it is to get it in, and then it's pretty painful to bend down. Although any mirror at all is a bonus, as often they're missing.
I would also very much say separate toilets would be better. Larger toilers with grab rails would suit lots of people, however the size you need to get an electric wheelchair in, to be able to close the door and manoeuvre around without tripping over it, and having a turning circle to get back out again is often under-estimated. Plus it does help when you're desperate.
I went to London today. First time in years as I'm mostly housebound, but I had lots of help and new painkillers, so thought I'd give it ago! I spent half the time hunting for an accessible toilet. By the time I got there I was bursting, and would have not been impressed with anyone just doing the 'only be a minute' dance who wasn't disabled. (I do have issues with needing to go quickly, but not all the time, just thought I'd give another perspective that sometimes accessible toilets don't exist at all, or are miles away so they're pretty valued).
I was already pretty depressed at the fact that all the places I used to go (Covent Garden), markets etc are now about 90% inaccessible to me. But having all the toilets I could find being located by stairs only was a cherry on top.
Also - for people with mobility issues, standing is usually ranging anywhere between mildly painful to want to rip my hair out and sob into it in agony, so not having to stand and wait unnecessarily (and yes, a disabled person using it is a necessary wait, a non-disabled isn't.)