The 'spinners' have been around for quite a long time now, but at one stage a few years back, it didn't take certain idiot's very long before they started to put chewing gum or blu-tak over the device,so causing a safety problem.
There was also the photographs of the two keys for access to 9000 public toilets around the country. If you know anyone who as a genuine cause to use a 'locked' public toilet urgently through a medical condition, then they can make an application to their local council for a 'Radar' key.
The Radar key can be purchased on line, as for the secret button it's been around for ages, if you like looking around try finding mobile masts disguised as something else or even the old ordinance cut marks above sea level i.e. the ones with an arrow pointing upwards with a line above it.
The man who comes to tune our piano is blind, and he told me about the spinning buttons a few years ago. I immediately had to go out and try one - sure enough, there it was, spinning when the lights changed to red.
I must apply for one of those keys I think. A recent fungal infection around my naughty bits caused me all sorts of problems in the sanitary wares department. Finding a normal toilet is a problem sometimes, so a list of their whereabouts and a key would be a Godsend. It will have to wait now until I get back from my happy holiday though.