Full casting announced for January
The new musical revue runs at Live at Zedel next month
They join the previously announced Julie Atherton in the musical which explores the 'worst month of the year' when everyone is counting calories and joining gyms.
Grover and Pickering recently starred alongside each other in productions of The Toxic Avenger (Southwark Playhouse) and The Stripper (St James Studio). Atherton's credits include Avenue Q, Sister Act and Shock Treatment.
Alexander Parker directs, with music and lyrics by Patrick Stockbridge and a book by Parker.
January runs at Live at Zedel from 23 to 25 January 2017.