Sir Daniel Grian Alexander is a former politician who was Chief Secretary to the Treasury between 2010 and 2015. He was the Member of Parliament (MP) for the Inverness, Nairn, Badenoch & Strathspey constituency from 2005 until the general election in May 2015. In his first parliamentary term (2005–2010), Alexander was the Liberal Democrat spokesperson for Work and Pensions (2007–2008), the Chief of Staff to party leader Nick Clegg, and Chair of the Liberal Democrat Manifesto Group (2007–2010).

Christopher Murray Paul Huhne is a British energy and climate change consultant, and former journalist, business economist and politician who was the Liberal Democrat Member of Parliament for Eastleigh from 2005 to 2013 and the Secretary of State for Energy and Climate Change from 2010 to 2012. He is currently chair of the UK green gas association – the Anaerobic Digestion and Bioresources Association – and senior adviser to the World Biogas Association. He also advises companies on his particular interest in renewable technologies that can provide back up for intermittent energy sources like wind and solar.