A cabinet secretary is appointed for a fixed tenure of two years. Simon is currently the Permanent Secretary in Number 10. "Over these few months of working on the Covid response, I have seen how much hard work is being done by the civil service to support the government and our country through unprecedented times," he said. Simon is currently the Permanent Secretary in Number 10.Simon will succeed Sir Mark Sedwill who announced he was standing down in June. The Prime Minister has appointed Simon Case as Cabinet Secretary and head of the Civil Service, the Cabinet Office has confirmed. After serving for decades with great distinction, I believe he has earned the gratitude of the nation.It is an honour to be appointed as Cabinet Secretary and Head of the Civil Service. “Over these few months of working on the Covid response, I have seen how much hard work is being done by the Civil Service to support the government and our country through unprecedented times.