Pop House Group CEO Per Sundin has told Music Week that Björn Ulvaeus’ Mamma Mia! The Party has been a “massive success” since its launch in Stockholm.

The original show in Sweden is set to enter its fifth year in business.

“He felt that as soon as the [Mamma Mia! stage] musical was finished, everyone was getting their coats to go home but they wanted to continue to party,” said Sundin.

“A lot of people thought, ‘Is it really going ...