I'm well aware of that fact. The fact is however that the Navy is so scattered at the moment (due to a wars on multyple fronts) that they'll hopefully have trouble really using there prowess to the fullest.
How would obstacles in the water work? There are plenty of places in the world that use guides for merchant ships to reach the harbour. I've also read about blockin ports by sinking ships at strategic places. It could even work wonderful with gunboats at those chokepoints in the Nile.
The Brits can destroy my trade in the Med, there's nothing I can do against that. So I want to focus on presurving my facilities and my resources in Egypt.
I've been doing nothing else since the beginning of this IH.