The posited deal merging H3G and O2 would create a new largest UK mobile operator with 40% market share, with massive synergy benefits available from cutting overlapping network and operations costs

Regulatory hurdles would be very significant, and the remedies required may well counteract the benefits of reduced network operator competition, as they will be designed to do

For Vodafone and EE, the impact will be mixed; a potentially aggressive competitor is removed, but their preferred positioning as being the best mobile networks is under threat

Ofcom has decided to implement a fibre margin squeeze test on BT, starting in March, which will include the costs of BT Sport as part of the calculation

Ofcom has stated that on its preliminary figures, BT does currently pass the test, but given earlier statements we conclude that it does not have a lot of headroom

This will make it challenging for BT to absorb the extra costs for its Champions League rights hitting from July without breaching the test, and even harder to absorb an increased cost for Premier League rights, reducing its incentive to bid aggressively in the upcoming auction