Governor

So like I mention in the Cecil paper you will find this reference dating from november 1561. At entry 840.

Has appointed Lord Hunsdon, Governor of Berwick. He is to proceed to take charge and government of Newcastle and the county of Northumberland under the Earl. Directs the Earl of Sussex to write to Sir John Foster, Warden of the Middle Marches towards Scotland, giving him instructions to join Lord Hunsdon. Hartlepool is to be safely kept. Has given order for a supply of munitions of war to be sent to him.

While eye brow raising is that most source will tell you that Henry Carey did indeed assume governorship of Berwick-upon-Tweed but he did so in 1568(I'm almost incline to think its a mistake, but really what are the odd that it is). What make it more difficult is that they don't quite seem to a proper list of the governor of Berwick-Upon-Tweed (or at least the one on wikipedia is pretty full of holes). So far the most convicing one seem to be from history of parliament and has you can see it doesn't mention him being governor in 1561. It goes from William 13th Lord Grey of Wilton to the 2nd Earl of Bedford (Francis, Russel, amusingly he is the son of John Russel, the man who apparently took Henry under his wings at some point).

Wiki mention that Lord Grey had retired of active command by 1561 (apparently from failling health , page 159 ) so I'm incline to think that he (like is son much later) were essentially place holder at Berwick until more official appointment came around.