Victory by Julian Stockwin.
Been battering through this series, only takes a day or two to read one but real proper adventure. This book can be taken as the second of a two-parter with Invasion. Both are about the build-up of Napoleon's forces for an invasion of Britain, and the navy's blockades to stop the French from "breaking out". A big build up to get to the end that was really excellent. The second book, Victory, unsurprisingly climaxes at the Battle of Trafalgar and actually leaves Kydd out and focuses on Nelson in the Victory. Truly excellent.
My only concern is the second main character in the series, Renzi. He seems to have lost his purpose in the series, and is essentially hanging about with Kydd for some lively discussions but doing not much more. Hopefully Stocking will find a place or purpose for him soon.