For all you who happened to find this entry regarding Abbey Road crossing...
There is a webcam that constantly records the Crossing:
http://www.abbeyroad.com/crossing
The website keeps an archive of the last 24 hours of video.
I was not able to access the archive with my phone, but it worked fine on an actual laptop.
So, once you cross, you basically have 24 hours to find yourself online.
To be sure... The video records from the wrong side of the street. Your video and pictures that you take from the middle of the street facing north will look much more accurate. But this website will do in a pinch
Bret
Los Angeles