Milford Haven in the coastal convoy network

What traffic used Milford Haven, and how busy was the port?

It was very busy, handling local and passing traffic as part of a system that used every viable port.

Milford Haven cannot be reduced to one cargo or convoy route. Its importance lay in being one of the viable ports through which a heavily used coastal system could marshal and pass shipping. The short answer reinforces the network's distributed character and the pressure placed on ports around the whole coast.