The UK telecoms and media regulator, Ofcom, is in increasingly hot water over its policies for spectrum caps and the country’s first 5G auctions. EE, the largest mobile operator and owned by incumbent BT, has joined the fourth-ranked MNO, Three UK, in threatening legal action against the moves. The operators want next month’s planned sale of 40 MHz of 2.3 GHz spectrum, and 150 MHz of 3.4 GHz to be postponed. The 3.4 GHz band is seen as suited to future 5G deployments, while 2.3 GHz is likely to enhance LTE, though both auctions will be technology neutral. Under the rules proposed for the auction, EE would not be able to bid for any spectrum in 2.3 GHz because of…