Effective Remedy
I am reluctantly of the opinion that not allowing the merger will just condemn both companies to slow lingering deaths. I am not sure that 3 ever had a financial structure that would have funded the ongoing investment requirements of running a mobile network. Vodaphone I rather blame the historic management of the company.
I feel two types of measure are necessary to permit the merger. The lesser issue would be the possible divestment of some of the merged companies spectrum. More important since the argument is about network investment is that Ofcom should provide the merged company with a prioritised list of not spots to which they should provide 5G coverage within 5 years. Failure to hit this target should trigger a fine of 10% of annual revenue each year until the target is hit.