There is bit of a misconception of Pax Britannica update :
GATHERING STORM :
Each time you found your first city on a continent other than your home continent recieve a free melee unit and a Trade Route capacity. Constructing any R.N.D grants you a copy of the strongest naval unit you can build. Gain the Redcoat unique unit when the Military Science technology is researched.
Royal Navy Dockyard : A district unique to England for naval activity in your city. Replaces the Harbor Distirct. Removes the Movement penalty for embarkation to and from this tile. Must be built on Coast/Lake terrain adjacent to land. +1 Movement for all naval units built in Dockyard, +2 Gold and +4 Loyalty when built on foreign continent.
RISE AND FALL :
All cities founded on a continent other than your home continent receive a free melee unit. After founding, constructing a Royal Navy Dockyard there will grant an additional free melee unit. Gain the Redocat unique unit when the Military Science technology is researched.
The Trade Route capacity is new/seemes to be attached to Victoria, and is removed from the Royal Navy Dockyard.