The wire you call the Switch Neutral is not a Neutral - It's Switched Live - i.e. Live when the switch is in the on position. It's often Black in colour and looks like a Neutral wire and is supposed to have a Red sleeve to show that it's special, scary & dangerous.
This wire, with the red sleeve (Switched Live) connects on its own to the light so it can be turned on and off as you operate the switch - you do not connect the light to Live - only to Switched Live. The other side of the light connects to the two Neutral wires.
Good luck...Take care...
Peccavi, March 2009