With effect from 1 April 2014, the Competition and Markets Authority (CMA), established under the Enterprise and Regulatory Reform Act 2013 (ERRA), has taken on the role of the new, single UK competition authority, taking over the competition (and some consumer) functions of the OFT and all the functions of the Competition Commission.

The ERRA does not make any changes to the substantive tests for merger control in the UK. However, the establishment of the CMA brings the existing two-stage merger control procedures under the Enterprise Act 2002 within a single body. It also amends the Competition Act 1998 and the Enterprise Act 2002, in particular to improve the quality of decisions and strengthen the competition regime, to support the competition authorities in taking forward the right cases and to improve speed and predictability for business.