Prince of Wales Theatre seating capacity slightly to 1,160 seats and to modernise the theatre's facilities. New bars were added, the auditorium completely rebuilt, the backstage areas refurbished and the theatre's famous tower and exterior completely gutted and refurbished with new LED lighting and a crisp modern finish. The theatre re-opened with ABBA's musical "Mamma Mia!" on 16 April 2004. On 18 August 2007, "Mamma Mia!" became the longest-running show ever at the Prince of Wales, overtaking the previous record held by "Aspects of Love" with 1,326 performances at the venue and counting. The production marked another landmark on Thursday 23 August 2007, celebrating
Which Witch in several national and international tours presenting continuously updated concert versions of the musical. The "Operamusical" "Which Witch" opened at the Piccadilly Theatre in London on October 22, 1992 and ran for 76 performances, after a critical savaging. It has been described as "the second worst West End musical of all time", a "bizarre musical", and "a dire rock opera". The London version was followed by a rather more successful Norwegian tour, and further performances of a Norwegian version in Holmenkollen, Oslo during the summer of 1994. "Which Witch" has, since its premiere in May 1987, been performed a total