Merger control assessments are becoming less predictable. The European Commission has changed its policy towards Member State referrals. The CMA has been flexing its broad jurisdictional thresholds to call in transactions for review. Driven by a desire not to let any transactions fall through the net, there is a key focus on innovative sectors such as tech and life sciences but the uncertainty extends across industries. Parties must be prepared to deal with the difficulties of navigating this increasingly complex environment.