What is the relationship between Quentin Purdy and District Judge in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

But District Judge Quentin Purdy rejected the application, saying he did not think expert evidence would be relevant to what he had to decide - which was not the facts of the case but rather whether the U.S. charges would also be offences under English law.

Answer: position_held