Strange that the maps seem quite old even though they are only putting them on google now - at King's Cross, the new St Pancras additions do not appear, indicating that it must be at leasr 2 years old.
Strange resolution over London as well - the satellite photo appears to be quite oblique from well to the North rather than overhead - something not seen on the US ones much. I imagine that getting an overhead of every point would be a massive achievement however, so it's not surprising.
I know what you mean about them being addictive!