MainstreamBPO Limited appoints Lucienne Layton and John Plummer to the Board MainstreamBPO has also confirmed the appointment of two new non-executive directors, Lucienne Layton and John Plummer, as part of its transition to a publicly listed company. John Plummer's professional experience includes more than 30 years of strategy, outsourcing, investment and business leadership experience. John has held executive and non-executive roles with Chandler Macleod Ltd. He is a director of Kinetic Super and has previously served on the board of listed investment companies and as chairman of AIFA Ltd.