Costain Group PLC announced that Kate Rock will be appointed to the Board on 1 November 2022 as an independent Non-Executive Director and Chair Designate and will assume the role of Chair from 1 December 2022. The Group announced on 9 March 2022 Paul Golby's intention to step down from the Board as Chair and non-executive director once the search for a successor had been concluded. Paul will remain in his current position as Chair until 1 December 2022.

As well as her role as Chair Designate and Non-Executive Director, Kate will be appointed to the Nomination Committee of the Board on 1 November 2022 and will become Chair of that committee on 1 December 2022 when she assumes the role of Chair of the Board. Since 2020, Kate has been senior independent director of Keller Group plc, having been appointed a non-executive director in 2018. Kate is a senior adviser at Instinctif Partners, and previously a managing partner of its predecessor College Hill Associates.

She is also, until January 2023, a Member of the House of Lords Select Committee for Science and Technology. Kate is a non-executive director of Unbound Group plc and was previously a non-executive director of Imagination Technologies plc.