A bit late now, but for picture 2 I googled the words on the flags, which took me to the image and the date.
And for picture 1 a google on what the thing in the picture was and what house it was in front of, got me the official description, that got me to the date - it was not 'the Trafalgar Square Christmas tree'
it isn't all just zoooooooom, sometimes extra sneakiness is required. But zoom helps.
Picture 3 required a memory of mother's fond description of the lapels on the coat she wore on her wedding day.