I've been using disabled toilets with mum for a few years now (since we bought her a rollator, but pre dementia). It's the size that makes the difference in being able to assist the PWD. I know they are designed to accommodate wheelchairs, but the size and equipment is helpful for so many others. I definitely could not get into a small cubicle with mum to help her out these days! I have actually never come across a disabled toilet which has been locked before (hence my original question about the value of obtaining one of these keys), but I guess we tend to frequent garden centre and large store toilets more than 'public toilets' as such. I look forward to testing the system when we are next out and about, but, as I say, I have yet to find a locked loo!