The SBS, Special Boat Service, are scary dudes. Not only was Jenny initially scared of Sgt Casey but the other members of the witness protection team in The Witness are careful not to look Casey in the eye.
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The Special Reconnaissance Regiment is a special reconnaissance unit of the British Army. It was established on 6 April 2005 and is part of the United Kingdom Special Forces (UKSF) under the command of Director Special Forces, alongside the Special Air Service (SAS), Special Boat Service (SBS) and the Special Forces Support Group (SFSG). The regiment conducts a wide range of classified activities related to covert surveillance and reconnaissance.