This excerpt is from page 12 of the Warhammer Annual 2002 in the section titled, "I'M GETTIN' OUTTA HERE!"
All of the principles outlined above apply equally to fleeing in subsequent turns. However, in this case my priorities are:
Move as directly as possible towards the nearest table edge.
Do not move through an enemy unit.
Do not move within 4" of an enemy unit.
Do not move through a friendly unit.
Now the imaginary line of fleeing runs towards the nearest table edge (measured from the closest model) rather than away from the cause, but all of the examples above hold true. The only situation that changes this is if the unit is charged by the enemy whilst fleeing. In this case, the line of fleeing is away from the charging unit.