In 1886, Sir Charles Warren became Commissioner. He and Monro never saw eye-to-eye. Monro had been widely tipped to succeed as Commissioner, and was disappointed not to do so. Warren also tried to assert his authority over CID, which his predecessor, Sir Edmund Henderson, had left almost entirely in Monro's hands. Warren was not particularly interested in detective work, but unlike Henderson he did not like Monro working directly for the Home Secretary without his approval. In 1888, the last straw came when Warren vetoed Monro's choice of Melville Macnaghten as first Chief Constable (CID). Both Monro and Warren threatened to resign. Home Secretary Henry Matthews accepted Monro's resignation in September and replaced him with Anderson. However, he retained Monro as head of Special Branch (which was outside the Commissioner's control) and gave him the title of Head of Detectives, with an office in the Home Office. Anderson and his senior CID officers continued to consult with him behind Warren's back, particularly during the Jack the Ripper case, with Matthews's complete connivance. Monro refused to accept a salary.
