Simpson was a fair and tolerant man. On his appointment as Chief Constable of Surrey, he had written to all his officers in his first order that "...For my part I look forward to a long tenure of office, during which I know that I and my family will be happy, and I trust that by the exercise of fairness in all my decisions, those who serve under me and their families will be equally happy".[A Hundred Years of Surrey Constabulary; 1851 - 1951] Simpson also expected the same high standards of others, whether officers or members of the public. Those were the standards that he set for himself and he was a great believer in discipline. He believed in a more equal police force, where senior officers and lower ranks had a closer relationship. A limited number of female police officers had been fully enlisted since 1919, under Commissioner Sir Neville Macready, albeit with limited powers and a rank carrying the prefix 'WPC'. Simpson welcomed this, as well as the development of the roles of special constables and police cadets. It is arguable that this openness to the 'diversity' of the day was somewhat marred by the promotion of fellow Hendon graduates as Deputy Commissioner and all four Assistant Commissioners; Trenchard's Hendon experiment was never popular with most officers, although actually these appointments were made by the Crown on the advice of the Home Secretary. He strove, with some success, to improve the deteriorating relationship between the police and the public and encouraged the public to "have a go" against crime, although he did issue a warning against tackling armed criminals. He was an enthusiastic supporter of crime prevention and the use of police dogs, and also greatly expanded the Police Cadets. He established the Obscene Publications Squad, Drugs Squad (1963), Special Patrol Group (1961), Art Squad (1967) and Antiques and Philately Squad (1967), laid the foundations for the Scenes of Crime Branch established shortly after his death, and greatly expanded the Flying Squad. He introduced personal radios and the Unit Beat system (1967), whereby the use of panda cars was greatly expanded for patrol purposes. He reorganised the Metropolitan Special Constabulary to integrate them more into the divisions. He introduced traffic wardens and fixed penalty parking fines.
