The UK broadband market faces a pivotal regulatory test. The Competition and Markets Authority has raised concerns over Nexfibre’s £2 billion plan to buy Netomnia’s owner, Substantial.
The watchdog provisionally found the deal could “substantially” affect competition. Its concern focuses on the wholesale broadband market. This market supplies network access to internet service providers.
The investigation now moves into a critical phase. The CMA has asked Nexfibre and Substantial to submit remedies by 16 October. It will then consult the market before issuing a final decision.
Nexfibre announced the acquisition in February. The company said the deal would expand its network reach. It aims to pass around eight million premises by the end of 2027.
That scale matters in the UK fibre race. Larger networks can attract more service providers. They can also spread build costs across more customers.
However, regulators must weigh that ambition against market structure. A merger between fast-growing fibre builders may reduce wholesale choice. Smaller providers could face fewer network partners in key areas.
At the same time, the deal could create a stronger challenger to Openreach. Many alternative network operators struggle with funding and scale. Consolidation may help them compete against the market leader.
Nexfibre’s shareholders strongly rejected the CMA’s interim view. A joint statement said: “The CMA’s Interim Report does not reflect the commercial and competitive reality of Britain’s fibre market. It fails to prioritise the fibre investment the country needs, and the creation of a scaled, sustainable challenger to Openreach.
“In its Strategic Steer to the CMA, the Government states that it ‘expects the CMA’s approach to clearly, and unambiguously, reflect the need to enhance the attractiveness of the UK as a destination for international investment’.
“This deal unlocks £3.5 billion of international investment, which would increase consumer choice and support the faster rollout of full fibre broadband nationwide.”
They added: “Standing in the way of this deal would suggest that Britain is closing the door on international investment, further entrenching Openreach’s monopoly, and leaving consumers to pay the price.
“We will continue to engage constructively with the CMA to secure an outcome that backs sustainable competition, investment and growth.”
The case highlights a wider dilemma for UK telecoms policy. The country wants faster full-fibre deployment. It also wants durable competition across wholesale and retail markets.
For engineers and network planners, the outcome could shape future build strategies. Investors will also watch closely. Regulatory signals often influence capital flows into fibre infrastructure.
The CMA must now decide whether remedies can address its concerns. These could include access guarantees or local competition safeguards. The final decision may set an important benchmark for fibre consolidation.
