"Don't buy scalped tickets" is a good lesson at any time. But really don't buy scalped tickets if you're in London to see Harry Potter and the Cursed Child. The production has just taken some drastic measures and you could be out a lot of money. The people behind the tickets and theatre where Cursed Child is being held have begun to require theatergoers to show their order confirmation along with the actual tickets to prove that they bought them from a legitimate seller. Anyone who can't prove this is refunded the face value of the tickets they have and denied entry. (Those seats probably then go to people in the standby line.)
"The secondary ticket market is an industry-wide plague, and one which we as producers take very seriously," said producers Colin Friedman and Sonia Callender said in a joint statement. "Our priority is to protect all our customers and we are doing all we can to combat this issue."
Since implementing this practice in recent weeks, about 60 people have been turned away so far. Maybe they can just go read the script.