How the UK taught interrogation techniques to Brazil's military in the 1970s

The BBC has been told that in the early 1970s, officers working for the military dictatorship in Brazil came to Britain to attend courses in how to extract confessions from prisoners.

This new kind of interrogation method came to be called the "English System".

A man who once led a Brazilian police death squad, Claudio Guerra, told Newsnight reporter Emily Buchanan that British agents also came to Brazil to teach the new techniques.

"They said the techniques were used in Ireland and had given good results," he says.

Emily Buchanan's film was broadcast on Newsnight on Thursday 29 May at 2230 on BBC Two. You can watch it on the BBC iPlayer.