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:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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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.