A landmark recent judgment of the Grand Chamber of the CJEU was the first occasion on which the CJEU has considered the validity of a decision authorising enhanced cooperation. This is particularly topical given the flurry of initiatives relying upon this mechanism, some of which are now being challenged (such as the UK’s proposed proceedings against the Financial Transactions or “Tobin” Tax). However, it also calls for a post in this blog as it raises a number of interesting practical and legal issues for competition practitioners. Continue reading