A friend and I had a backstage tour at the Royal Opera House, Covent Garden and it was excellent. 1 ½ hours well spent during our day out in London. We had booked and I would advise this, although you may be lucky if you happened to chance by one day. Martin our guide made the tour very interesting and we were extremely fortunate to be shown inside the auditorium during a break in rehearsals which apparently is a rare opportunity. We wasn't allowed this time to visit the workshop rooms as they were very busy. It was brought to our attention that should we wish to do a visit another time that we would possibly be shown different areas, as it all depended on the day what a visitor could or could not see. I for one will surely be arranging/suggesting more visits with friends in the future, as I feel so many would enjoy the tour. At £12 this is a worthwhile experience and if by chance you could arrange the tour before a viewing a performance, then I would think that would be the icing on the cake so to speak of your day.