Mark Williamson

Non-executive Director & Senior Independent Director


Our Senior Independent Director acts as a sounding board for the Chairman and serves as an intermediary for the other Directors, as well as shareholders as required.

Appointed: 3 September 2012

Committee Membership: Finance, Remuneration and Safety & Sustainability

Tenure: 9 years

Career: Mark is a qualified chartered accountant. He has a strong financial background and significant financial experience gained from roles as Chief Accountant and then Group Financial Controller of Simon Group plc, and Financial Controller and later Chief Financial Officer of International Power plc. Mark was also a Non-executive Director at Alent plc where he was Chairman of the Audit Committee and Senior Independent Director.

Skills and competencies: As a qualified chartered accountant, Mark brings considerable financial and general managerial experience to the Company. His previous roles as Chief Financial Officer of International Power plc, Non-executive Director and Senior Independent Director of Alent plc and Chairman of Imperial Brands PLC cement his extensive financial experience and give him a deep understanding of the utilities sector.

Mark stepped down as Chair and member of the Audit & Risk Committee in November 2020, offering guidance and support to Liz, as she succeeded in his role as Chair of the Audit Committee. In his role as Senior Independent Director, Mark brings an excellent understanding of investor expectations as well as providing significant insight into managing relationships with investor and financial communities.

External appointment:

  • Chairman of Spectris plc