I'm not sure when the first book in the series was published - probably about 5 years ago. The last (5th) book in the series came out a few months ago. They are quite the rage with my daughter and her friends, though she is quite looking forward to Alice in Wonderland too. She's been talking about that for months and we plan to see it opening day.
HP Galleries Wing at St Mungo's is in no way affiliated with JK Rowling, her publishers, Warner Brothers, any of its partners within the Harry Potter franchise, or any religious or healthcare institution.