Sir Robert Mark
QUOTE
In 1972, Sir Robert Mark became Commissioner of the Metropolitan Police. That year, the annual total of armed robberies in the Metropolitan district was 380 - partly because the culture was rife with bribe-taking, sharing in the proceeds of crime and "verballing", or fabricating evidence against suspects. Sir Robert felt compelled to remind his detectives which side of the law they were supposed to be on, he told them in his inaugural address: "A good police force, is one that catches more criminals than it employs."

At the centre of Sir Robert's focus was Criminal Investigation Department, and its pinnacle the Flying Squad - Ken Drury, commander of the Flying Squad and one of his inspectors, Alistair Ingram, later went to prison for corruption.

Sir Robert pushed such investigation - of names such as Mehmet Arif, George Davis, Ronnie Knight, Freddie Foreman, Micky McAvoy - out to the suburban regions, who needed to employ new tactics to catch the bigger criminals they were now faced with. 
UNQUOTE
Corruption in the Met is deep seated and very sincere. It will happen while bent coppers frighten any straight ones; not vice versa. Robert Mark was the last Commissioner who showed serious indications of wanting to sort the bent ones. He got rid of 300 and that was just in the CID.