Sky has called on telecoms regulator Ofcom to carry out a formal review of Openreach to determine whether its continued affiliation with BT is breaching competition regulations.
The latest move in the long-running market battle between Sky and BT comes after the former claimed that the latter has an unfair hold over the nation's telecoms network.
According to Sky, Ofcom must use its once-a-decade review of the industry, which is taking place this year, to assess whether the arrangement between BT and Openreach is in the best interests of consumers, competitors and the country as a whole.
According to Mai Fyfield, Chief Strategy Officer at Sky, there is sufficient evidence against BT for Ofcom to ask the Competition and Markets Authority to conduct a complete competition inquiry.
"We are drawing attention to the problems in broadband because they are important to the economy as a whole," she explained to the FT.
"They affect competition between providers and have a direct impact on consumers and small businesses, resulting in inconvenience, dissatisfaction and loss of productivity."
Sky has long called on BT to be split from Openreach, saying the arrangement arguably benefits BT's retail division, regardless of the money invested in it - a claim supported by fellow market rival TalkTalk.
As part of its evidence gathering to support its calls to Ofcom, Sky alleges Openreach misses more than 500 appointments each month to install new lines for Sky customers, and also claims that fault rates across Openreach’s network increased by 50 per cent between 2009 and 2012.
In response to the submission, BT says that Sky's accusations are largely conjecture, and that its investment in Openreach is continuing to increase.
"The forthcoming Ofcom review is an important piece of work so it is disappointing that Sky are engaging in selective spin rather than constructive dialogue," the telecoms giant stated.