+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
London has more heavy load these days, they are dealing with apps from Pakistan now as well. They also deal with applications from Middle east and UK. I think if u r in Canada choose buffalo on the other hand you can try UK as well. I now one of my British friend applied to London office and got 2nd AOR in 3 months in June and no update yet, so may be processing time same for both countries.