[Col7777]

Don't get too excited, some of you probably know all this but for those that don't here is what I did.
Because there is no British submarines modelled in the sim yet, I had to use a U-boat as the Brit sub.
I copied a u-boat file from the Roster - German - Submarine folder and pasted it in Roster - British - Submarine folder.
Then I created a test mission to try it, the sub was listed as Allied (British).
I then placed it around Wilhelmshaven and put a few German ships in the area plus a few aircraft, I let myself be spotted just to make sure it was working, and it was.
I got fired on straight away, I was recognised as an allied submarine.