OK Husk,
It's obvious for me that you didn't restart campaign with hotfix2 enabled but that's OK. From some reason game registered over 75000 tonnes scored in northwestern approaches and that's the reason why you haven't been able to request patrol area. It could be that battleship from Scapa Flow is registered in both missions , EBCW and NW Approaches, this happened to me once too...
I've made few changes in your campaign.cfg file which will add all the changes available in hotfix2 so you can be able to continue your campaign without any problems.
So what you have to do...
Enable Hotfix2 following install instructions and...
Replace Campaign.cfg file that you gave with this one and continue your campaign using the same gamesave...
Campaign.cfg download