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I now have access to 'Kenways Fleet' and am busy sending out ships to do trade missions. However most of the routes seem to top out at about 700R in 4 minutes.
Are there any more profitable trade routes? Do these routes require certain types of ship?
Destroying ships yields only half of their cargo. So, it's generally better to board them. If a ship has gold, sinking it will still give you all the gold.
And, as you suspect, later on you will be able to capture ships and send them on missions to earn credits.
To open the route to Britain, you have to do a mission called "Door to Europe" in Kenway's Fleet. It is part of the South African route. It will unlock "Bristol", which is located in Southern England.
The other mission you need to do is called "Meet the Tributes I" in Kennway's Fleet. It is part of the Cape Verde Route. It will unlock London, the capital city of Great Britain.
Best Answer
As you progress with the trade routes other locations open up. They become more and more profitable as you continue to open more locations. The more profitable locations do require larger ships(more cargo space) like the Man o' War. These more profitable routes also take more time though.
For a list of better ship locations, names of other Trade Missions and tips check the link:Kenway Fleet Guide