<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. 87)</a></li><li><a href=https://www.ofcom.org.uk/__data/assets/pdf_file/0020/112475/wla-statement-vol-1.pdf  target=_blank>Wholesale Local Access Market Review: Statement – Volume 1 , March 2018(Last updated in August 2020)</a></li></ul>