<ul><li><a href=http://www.legislation.gov.uk/ukpga/2003/21/contents target=_blank>Communications Act(Communications Act 2003, last updated in December 2017, s. 74)</a></li><li><a href=https://www.ofcom.org.uk/consultations-and-statements/category-1/business-connectivity-market-review-2016 target=_blank>Business Connectivity Market Review(Final Statement of Business Connectivity Market Review, Ofcom, 28 April 2016)</a></li></ul>