Yesterday my husband was in London and reported to me that there are pianos there now, out on the street, that anyone can play. They have signs on saying "Play me, I'm yours". He played one.
Sadly they're not permanent, they're just in place until 13th July. An amazing idea though. It sounds like the kind of thing we would see abroad and say, "I wish they would do things like this in London but I can't imagine it ever working."
There's an article about it here.