Some of key figures with links to botched RHI green energy scheme
Former permanent secretary at Deti. In February he moved from leading the Department for the Economy to become director general of International Relations, heading up NI's preparations for Brexit.
was special adviser to then Enterprise Minister Arlene Foster when the RHI scheme was developed and launched in autumn 2012. He has appeared a number of times in front of the RHI Inquiry.
Former special adviser to three First Ministers: Ian Paisley, Peter Robinson and Arlene Foster. Last year the DUP appointed him to the newly-created senior post of chief executive officer.
Former special adviser to Jonathan Bell when he was Minister of Enterprise, Trade and Investment. He is now a member of the board of cross-border business body InterTradeIreland.