Sir Dave 05

I have been playing a UK 1920 campaign for a couple of weeks now with no issues. A battle has come up where I am defending a convoy from 3 destroyers, however when I attempt to start the battle the loading screen appears with the divisions being created in the bottom right and when it gets to a transport division the game freezes. I have waited for over an hour and whilst the music still plays it is still stuck on loading the same transport division. I have restarted the game a number of times but the same issue occurs when I try to load the battle.