Board of Directors

  • member 1

    Ian Sutcliffe


    Ian has wide-range experience of and a significant track record in the property and construction sectors. Ian was Group Chief Executive of Countryside Properties plc until his retirement in early 2020. He was also previously Senior Independent Director at Ashtead Group plc, UK Chief Executive of Taylor Wimpey plc and Chief Operating Officer of SEGRO plc.

  • member 2

    Graham Barnet


    Graham co-founded Sigma in 1996, and has been involved in investment and residential property development throughout his career. He is also the architect of The PRS REIT plc, the quoted first real estate investment trust to focus on new family rental homes.

    An experienced corporate financier and a qualified lawyer, Graham initially worked at Shepherd & Wedderburn and Noble Grossart. In 1994, he established Merchant Investments Ltd, a family investment vehicle, which specialised in large-scale residential development. Merchant Investments Ltd led the creation of the Winchburgh development, situated three miles west of Edinburgh. It is one of the largest single housing delivery sites in Scotland, with 3,500 new homes, five schools, a new town centre and railway station.

  • member 3

    Mike McGill


    Mike joined Sigma as Group Chief Financial Officer in 2020. As well as assuming executive responsibility for the overall financial management of the Group and its subsidiaries, he is responsible for financial matters relating to The PRS REIT plc.

    Mike has over 25 years of experience in senior financial roles at listed and private companies across a range of sectors, including residential, commercial and industrial property, international food manufacturing, logistics, warehousing and distribution. He has significant corporate finance and transactional experience, including in mergers and acquisitions. Mike qualified as a chartered accountant with Coopers & Lybrand in 1991.

  • member 4

    Duncan Sutherland


    Duncan joined Sigma in 2013 and has been instrumental in establishing and developing the Company’s Partnership model, and in particular its relationships with local government partners. He has extensive experience in urban regeneration, spanning residential, commercial, retail and community schemes.

    Duncan serves on the Capital Investment Advisory Board in the Department of International Trade (DIT) and on the Board of Homes England, the executive, non-departmental public body, sponsored by the Ministry of Housing, Communities & Local Government, which is spearheading the accelerated delivery of housing. He was previously a Non-Executive Director of the British Waterways Board and Scottish Canals and completed a six year term on the Board of HS2 Ltd.

  • member 5

    Gwynn Thomson


    Gwynn was appointed on to the main Sigma Board in 2011. He has over 26 years’ experience in the property markets, including property investment. In addition to his wide-ranging property experience, he has a well-established reputation for his technical ability. Prior to joining Sigma, Gwynn was a Director of Investment and Valuation at a leading property consultancy.

    He is a member of the Royal Institution of Chartered Surveyors and an honours graduate of Aberdeen University, where he studied Land Economy.

  • member 6

    David Sigsworth OBE


    David spent over ten years as a main board director of FTSE 100 utility companies, including Scottish and Southern Energy plc (SSE). He was responsible for a £1bn programme of investment at SSE, and had responsibility for all of SSE’s environmental issues, managing one of the largest and most diverse generation fleets in the UK.

    David’s career in the energy sector spans 50 years and he remains an active player in off-shore renewables, combined heat and power, smart grids and low energy buildings.

    David is an Honorary Professor at Dundee University and active in promoting start-up companies involved in the development of technologies relating to clean energy and energy efficiency. He is also Chairman of the Scottish Environment Protection Agency (SEPA), Chairman of the Scottish Fuel Poverty Forum, Chairman of the Dundee Science Centre, Vice President of the Combined Heat and Power Association (CHPA), as well as a trustee of the think tank Sustainability First.

    David was previously Chairman of Sigma Capital until May 2020.

    He was awarded an OBE in 2016 for services to the environment and sustainable futures.

  • member 7

    James McMahon


    Jim is a former senior partner in PricewaterhouseCoopers and was a founder partner of WCC with Sir Tom Hunter in 2001. He has ten years’ experience in private equity, retail and public companies including at Office Shoes, Booker plc, Flying Brands plc and Prestbury Group.