Tug Felicity towing the sub into the lock in the video. My first job after qualifying as a junior seaman following 3 years as a cabin boy. And 40 years, dozen of ships and a handful of bases later my last job afloat as her skipper at Devonport.
Small correction, It's Bull Nose, not Bull's Nose. The area between the locks to the seaward side. The building also called Bull Nose housed the RN Port Control, civvy Tug Control and the civvy Admiralty Pilots. Had my job interview there as a wet behind the ears 15 year old straight out of school.