Andrew Hamilton • Link
The Oxford Dictionary of National Biography has posted a free on-line essay on the Great Fire of London that broke out Sunday Sept. 2, 1666 (essentially three days hence in the diary timeline).
"framing my great letter to Mr. Hayes about the victualling of the fleete, about which there has been so much ado and exceptions taken by the Generalls."
L&M: https://www.pepysdiary.com/diary/1666/08/26/ and https://www.pepysdiary.com/diary/1666/08/26/#c284…
James Hayes was Rupert's secretary. His letter to Pepys (Southwold Bay, 19 August; endorsed 'arrived 23 Aug.') is in Rawl. A 176, ff. 207-8.