Fans are being warned against purchasing tickets for 'Harry Potter and the Cursed Child' on resale websites as almost 60 ticket-holders have so far been refused entry.

The eighth installment of the Harry Potter franchise opened as a stage show at the Palace Theatre in London earlier this year, with tickets selling out until December 2017.

It has led to a huge surge in demand, with single tickets on resale websites listed for up to £6,200 each.

Producers have said they are doing everything in their power to combat high prices, but warned fans against purchasing tickets from "touts or the secondary market".

They said: "Staff at the Palace Theatre refuse entry for tickets that they are able to identify as re-sold.

"We have already been able to identify and refuse entry to a significant number of people who purchased tickets through resale sites and will continue to track down touts and refuse entry to anyone who has knowingly bought a ticket from a tout through the secondary market".

In August, 250,000 tickets were released for performances through to December 2017 but sold out within a day.

However the theatre holds an online lottery every Friday in which 40 tickets are released for the following week, but some fans can see why people opt to pay higher prices.

One fan told reporters: "I've never seen a piece of play like this ever, so I can understand why people would pay that kind of money. I don't necessarily agree with it but it's been out of this world, absolutely".