[3][4] He then extended his repertory in a wide variety of roles which he undertook on tour with the actress Florence Nellie Glossop-Harris (d. 1932), daughter of the actor-manager Augustus Harris, whom he married in 1910.

"[3] Once established, Cellier pursued a career balancing new commercial plays – sometimes farce, often murder drama – and classical roles.

His favourite part was Hamlet, and his other Shakespeare roles included Apemantus in Timon of Athens,[8] the title role in Henry IV, Part 2,[9] Cassio in Othello,[10] Touchstone in As You Like It,[11] Angelo in Measure for Measure,[12] Ford in The Merry Wives of Windsor,[13] Quince in A Midsummer Night's Dream[14] and Kent in King Lear.

His roles in these included the Nobleman in The Man with a Load of Mischief (1925), one of Marie Tempest's suitors in Noël Coward's The Marquise (1927), Sir Peter Teazle in The School for Scandal (1929) and the King in the Improper Duchess (1931).

He starred in The Duchess of Dantzic in 1932 and appeared as the Marquis D'Arcy in The Mask of Virtue (1935; adapted by Ashley Dukes from a German play, Die Marquise von Arcis, by Carl Sternheim), opposite Vivien Leigh in her West End debut.

His final stage role was the father in Terence Rattigan's The Winslow Boy in 1946, which he played to great praise in London and was due to take to America but was prevented by ill-health from doing so.