Exclusive: Laura Pitt-Pulford and Fra Fee perform Sondheim's "Loving You"
The pair will star in Smiles of a Summer at Cadogan Hall next month
The cast also includes David Birrell, Lauren Morris, Jordan Lee Davies and Tamsin Dowsett.
Following successful collaborations on concerts of A Little Night Music and My Fair Lady, musical director and composer Alex Parker reunites with director Alastair Knights to present the concert celebrating the music and lyrics of Sondheim.
The show will feature music from works including Sweeney Todd, Sunday in the Park with George, Into the Woods and Follies.
Sondheim: Smiles of a Summer Night plays Cadogan Hall on Sunday 4 June.