Over about the last hour the spread has remained fairly constant or grown slightly to the Leave favor.
An hour ago when I started checking the spread it was a margin of 346,331 in favor of Leave.
Over the past hour it went as follows with periodic checks.
489,217 favor Leave
484,605 favor Leave
462,907 favor Leave
Time to que the “Hitler in the Bunker is informed Britain votes to leave” video....