Theatre producer Cameron Mackintosh has tasked heritage specialist Watson Bertram & Fell with creating a two-storey penthouse and roof garden at one of the eight West End venues in his Delfont Mackintosh empire. 

Mackintosh, whose hits include Cats, Les Misérables, Phantom of the Opera and Miss Saigon, wants to convert the top two floors of the Ivor Novello Theatre on Aldwych from office use back to residential.

In addition, the plans will also require listed building consent because the theatre, which dates back to 1905 and was designed by William GR Sprague, is grade II listed.

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