CAI for Britain doesn't appear to be functioning fully. Nelson has disappeared and London still hasn't built barracks in Summer 1805. Ports are also undefended.
Originally Posted by DARTH VADER
Usually Britain combines it's navy on turn one, spends the next turn in the port shown below, spends the next turn occupying the Batavian Republic's port, then disappears (I usually find Nelson and the main British fleet several turns later occupying a trade node).
To test this Beta Darth, I copied your beta pack, replacing the one I was using (Bran's) here -- C:\Program Files (x86)\Steam\steamapps\common\napoleon total war\data -- and started a new campaign France 40 units European.
Here's London and undefended port in late June 1805:
And sure enough here is Nelson's "lost fleet," occupying the trade node opposite Portugal, which is where I usually find it. Turns out that a Dutch merchant fleet starts the game on this trade node. They leave when the British fleet blockades Amsterdam, returning home to "defend" their port. In reply Nelson apparently moves to occupy the now vacant trade node with a merchant ship or two and remains there for the rest of the game.