> The UK regaining sovereignty over territorial waters for fishing purposes. These waters have been heavily overfished and the tragedy of the commons has definitely applied here. Ironically when the EC was originally formed the UK refused to join. Had they done so they would've maintained sovereignty over territorial waters. When they later joined they didn't.

I don't think this is going to happen at all. Most fish landed in the UK are exported to the EU. Kicking out their fisherman and then selling them the fish sounds like a very unlikely outcome to me. Macron has already flagged this