I am not a teacher.
1) I don't think it ever produced salt. Haslar Creek is a sea water creek as opposed to a fresh water one.
2) Horatio Nelson, full title Vice-Admiral Horatio Lord Nelson or 1st Viscount Nelson. Probably the best known British naval officer ever. Killed during the battle of Trafalgar and is commemorated by a statue on a tall column in London's Trafalgar Square.
3) It's because tramlines do not use paddles that if you are sent by tram you are without a paddle.