U.K. police officers aren't above the law. Can't find a recent survey, I think they do them every five years. From 2015:-
Officers convicted of offences
PC Keith Wallis was jailed for 12 months for lying about witnessing an altercation in Downing Street involving the former Tory chief whip, Andrew Mitchell.
Osman Iqbal was given 7 years of jail time for prostitution, supplying a class-A drug, and money laundering in 2014.
Chris Higgs admitted to 16 crimes, including blackmail, fraud, perverting the court of justice, and witness interference, in March 2015.
Constable Trevor Jones jailed for 14 months after bombarding vulnerable women with sleazy text and voice messages in June 2015.
Sources: Sunday Times, The Guardian and Machester Evening News
https://www.ibtimes.co.uk/1600-uk-police-officers-arrested-criminal-offences-5-years-1519573