HAve been there last year (awesome) and booked in advance - gonna see the german version of it on April 24th (1 day b4 the dortmund show)
If i won't get my ticket i will go to the musical instead :(((
Guess you will get tickets at leceister square where they sell even tix for so-called "sold out shows" for a great price (way cheaper) - if you want more info contact me!
Hoping for my tix this week!!