UK regulator Ofcom said on Friday that it has proposed controls on the wholesale prices BT charges for products using leased telecoms lines, which provide high-speed links for businesses and providers of superfast broadband and mobile services.Ofcom is consulting on the proposed level of those controls, which would apply to some of BT's wholesale leased line prices.The new controls should lead to significant real-terms price reductions for most customers of the £2bn leased lines market, such as businesses, schools, universities and libraries, said Ofcom.Consumer mobile and broadband operators, which use leased lines to transfer data on their networks, would also see savings which could be passed on to customers.Ofcom expects to publish its final decisions in the first quarter of 2016, taking effect from 1 April 2016.