You have no doubt read what I say about photographs. They should be looked into and not at.
I should have taken my own advice with a photograph I published last week and my thanks go to Keith Cowley for pointing something out.
The picture was of the diesel loco approaching HMS Victory, possibly some time in the 1950s. Look closely behind the locomotive and you should see that the bowsprit jackstaff is flying the Union Flag at half-mast. The White Ensign on the ensign staff at the rear of Victory’s poop deck was also at half-mast.
It is possible that a former Portsmouth commander-in-chief had recently died but as there is no date for the photograph I can’t say for sure.