Sian Williams joined the BBC’s Breakfast programme in 12 January 2001 as a relief presenter, initially presenting on Friday-Sunday alongside Darren Jordon, to cover for main presenter, Sarah Montague, and then later with Jeremy Bowen, to cover for Sophie Raworth. She also regularly deputised on the Six O’Clock News and the One O’Clock News during this period. In 2004, Sian Williams covered for Sophie Raworth on the Six O’Clock News during her maternity leave, co-presenting with George Alagiah, and the following year, reported from Sri Lanka and Thailand on the 2004 Indian Ocean earthquake and from Pakistan on the Kashmir earthquake.
In May 2005 Sian Williams was confirmed as the main female presenter of BBC Breakfast, presenting initially alongside Dermot Murnaghan and since January 2008 with Bill Turnbull on Mondays to Thursdays. Sian Williams left Breakfast on 15 March 2012 due to the programme’s relocation to Salford. She joined BBC Radio 4 to co-present Saturday Live for a while. In addition to this Sian Williams will be a relief presenter for all the main BBC One News bulletins.
Other television credits include for BBC Wales the One Show, with Aled Jones, and the Big Welsh Challenge, where she spent a year learning Welsh as well as presenting BBC One daytime programmes including Now You’re Talking and City Hospital. In 2010, Sian Williams reported for Watchdog. In 2013, Sian Williams hosted Your Money Their Tricks with Nicky Campbell and Rebecca Wilcox. Sian Williams also presented a three-part interview series for BBC One Wales titled “The Sian Williams Interview”. She interviewed Tanni Grey-Thompson, Suzanne Packer and Sian Phillips in the three programmes respectively.
In June 2014, Sian Williams became the new presenter of Sunday Morning Live – a religious and ethical debating programme airing on BBC One every Sunday morning from June until November. Sian Williams replaced Samira Ahmed.