The sealed invitation was from the man himself: no, not Andrew Lloyd Webber (who can, as we know, work in mysterious ways) but the Phantom. Nightly (and twice on Tuesdays and Saturdays) he vanishes from his underground lair deep in the bowels of the Paris Opera House (aka Her Majesty’s Theatre) leaving only his familiar half-mask as a symbolic reminder of his continuing omnipotence on stages throughout the world.