Another reason to believe that he is a Londoner is
While there are valid clues in this direction, other clues go to something way different.
I've read few days ago an analysis made by Jameson Lopp on Satoshi's mining (an interesting read, btw) and one of the conclusions was:
My conclusion is that Satoshi maintained a sleep schedule consistent with someone staying in the Pacific time zone.
So... a Londoner living in LA area or in British Columbia?
