Revealed: spies for hire used ‘Big Brother’ tactics on salmon farm activists

Guardian investigation sheds light on private intelligence industry that runs covert surveillance operations

• Is surveillance by private operators legal in the UK?

Wildlife activists who exposed horrific conditions at Scottish salmon farms were subjected to Big Brother" surveillance by spies for hire working for an elite British army veteran.

One of the activists believes he was with his young daughter on at least one of the occasions when he was followed and photographed by the former paratrooper Damian Ozenbrook's operatives.