“Not until I came to Whitehall did I learn that the country was run by two men, neither of whom I had ever heard of”, said Lord Victor Rothschild of his 1970 meeting with Sir Burke Trend and Sir William Armstrong, secretary to the cabinet and head of the home civil service respectively. But increasingly lurid attention from The Daily Telegraph, The Times and the Daily Mail, along with their Sunday siblings, is making sure that latter day grandees will have no such ignorance as to the name and power of the cabinet secretary since January this year, Sir Jeremy Heywood.

Now new permanent secretary Jon Thompson has his feet well under the table at the Ministry of Defence, he will be on the receiving end of a lot of good – and not so good – advice. I can offer a few thoughts about how the momentum of reform can best be maintained in a high-tempo department characterised by its preponderance of alpha personalities and diversity of vested interests.