Which? executive director Richard Lloyd, said:
“The UK telecoms regulator has confirmed our fears that this merger could reduce choice and competition in this market and result in significant detriment to UK consumers.
“We’ve written to the European Commission to set out our concerns and ask that they look carefully at claims that consolidation, rather than competition, will drive investment in the sector.
“Should this merger be cleared, it is essential that any remedies imposed by the Commission are more effective than those imposed in recent similar European mergers to ensure UK consumers are properly protected from price rises and poor customer service.”