I did have tickets for this but when I got back from my holiday, there was a letter waiting for me, saying that the performance was cancelled.
Apparently, they had realised that they needed more time between shows to re-set up the special effects so they had to cut the number of shows in a day.
There was an offer to re-schedule but I decided to just take the refund instead. My lad wasn't particularly enthusiastic about going anyway.
Hope it's good for those still going to see it.