Veteran journalist Tim Tate tells the story of Peter Wright, the crusading MI5 whistleblower who humiliated the Thatcher government in the 1980s. As the British security services' chief scientific officer, Peter employed unsavory tactics to root out Soviet spies - but a dramatic change of heart would come to define his controversial legacy. From SPYSCAPE, the HQ of secrets. A Cup And Nuzzle production. Series producer: Joe Foley. Produced by Morgan Childs.