Are you running the stock game or a modded version? If its stock, after sept 3rd (i think) the fun starts. British ships become targets. They will show up as red contacts on the map. Green contacts are neutral. Dont attack any neutral ships. As more and more time goes on more countris go to war with germany. You will get a radio report telling you what countries are at war with you. Ive been up for a long long time now so ill have to read this tomorrow to make sure what I wrote is correct.