The UK’s departure from the EU’s competition regime in 2020 introduced the prospect of parallel CMA-Commission reviews. However, the risk of divergence between the two authorities has achieved new prominence as a result of the controversy surrounding the reviews of Microsoft’s acquisition of video gaming company Activision Blizzard, which the CMA initially prohibited, in sharp contrast to the Commission’s decision to accept behavioural remedies. Against this background, this article considers what lessons can be drawn from the parallel reviews in the first three years following the end of the transition period. It concludes that while divergence of some form can be seen in a significant number of cases, consistent outcomes remain the most common result, with apparent variances sometimes explained by differences in market conditions as between the UK and the EU.