<ul><li><a href=http://www.legislation.gov.uk/ukpga/2003/21/contents target=_blank>Communications Act(Communications Act 2003, last updated in July 2003)</a></li><li><a href=https://www.ofcom.org.uk/__data/assets/pdf_file/0029/216794/statement-2021-26-wholesale-voice-markets-review.pdf target=_blank>Wholesale Voice Markets Review 2021-26( )</a></li></ul>