Ain't nothin' shakin' but my wee Scottish knees

I don’t usually take part in these challenges but I noticed that this one is about memory. In 1978 my pal and I were in northwest London, breaking our journey from Scotland to France. We decided to go to Abbey Road to take some silly photos. But as we were approaching the famous recording studio, there seemed to be a little stir on the pavement. Who could it be? I clocked Linda McCartney before I recognised her slightly shabby looking husband. They duly posed for me so that I could take this shot on my tiny Kodak 110 camera. Then my knees began to shake.