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Ch Supt Mark Hall said the force would continue to support the families of those who died.

"We found three suspected victims of modern day slavery hidden in a lorry," said Det Ch Insp James Ansell, describing the moment his officers entered the vehicle near a stretch of the M25 known by police as a "hotspot" for finding trafficking victims.

"The most usual place we find these happening is at Cobham or Clacket Lane services," Det Ch Insp Ansell said.

Hugh James solicitors told the BBC it was pursuing claims relating to four military aircraft - the Sea King, the Westland Wessex, the Puma and the CH-47 Chinook.

The Westland Wessex was retired in 2003 while the Puma and the CH-47 Chinook are both still in use.