Q: Passage: "Billy Do n't Be a Hero" is a 1974 pop song that was first a UK hit for Paper Lace and then, some months later, a US hit for Bo Donaldson and The Heywoods. The song was written and composed by two British songwriters, Mitch Murray and Peter Callander.

Question: Based on this passage, who wrote the song billy don't be a hero? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: The song was written and composed by two British songwriters, Mitch Murray and Peter Callander. Therefore, the final answer is two British songwriters , Mitch Murray and Peter Callander.