Anthony Horowitz well known British writer  of the British TV. series "Foyles War"featured episodes of the  double dealing by British Intelligence concocted during and after the second world war. 

Nothing changes.

This T.V series has been viewed all over the wold  depicting  the inner workings of British Intelligence at that time and I am sure today.

They as do other countries  intelligence organizations  do not a ways  operate by   Queensberry rules and from time to  time have soiled hands.