The files arrived marked ‘STRICT EMBARGO’ and ‘CONFIDENTIAL’ and ‘FORTH BRIDGE REVISED’ and stamped with various crests and insignia. My dog Mot was intrigued and sniffed the stack warily. I have a few days to ingest this mass of information — ceremonial detail, armed forces involvement, order of service, processional arrangements, musical selections, historical precedent, the unabridged chronicle of Windsor and its College of St George and its splendid chapel — before hosting the BBC’s coverage of the funeral of the Duke of Edinburgh.