Conversation so far:
When did Mortimer start writing?
World War II.
What type of works did he write?
He worked for the Crown Film Unit under Laurie Lee, writing scripts for propaganda documentaries.
Did he write any novels?
Charade.
When did he write Charade?
CANNOTANSWER.
Did he write any other novels besides Charade?
Mortimer made his radio debut as a dramatist in 1955 with his adaptation of his own novel Like Men Betrayed for the BBC Light Programme.
How did he adapt it?
play.
Did he do any other plays?
His play A Voyage Round My Father.

Question: When did he write that play?
Self-contained rewrite: When did John Mortimer write Like Men Betrayed?