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 ... when he was followed and photographed by the former paratrooper Damian Ozenbrook's operatives. The surveillance of [Corin] Smith and another wildlife activist, Don Staniford, began after they paddled out to some of the floating cages where millions of salmon are farmed every year ... and filmed what was happening inside. The footage, posted online and broadcast by the BBC in 2018, showed fish crawling with sea lice. Covert surveillance by state agencies is subject to legislation that includes independent oversight. But once highly trained operatives leave the police, military or intelligence services, the private firms that deploy them are barely regulated. Guy Vassall-Adams KC, a barrister who has worked for the targets of surveillance, including anti-asbestos activists infiltrated by private spies, believes these private firms "engage in highly intrusive investigations which often involve serious infringements of privacy." He added. "It's a wild west." One firm, run by a former special forces pilot, was found to have infiltrated Greenpeace, Friends of the Earth and other environmental groups for corporate clients in the 2000s. Another, reportedly founded by an ex-MI6 officer, was hired in 2019 by BP to spy on climate campaigners.