Craig, follow the list below and it should work for you.
1. WoWLAN only works when the system has been sent to standby or hibernation
2. The laptop must be connected to a power adapter, it doesn't work off a battery (as far as i know) * note that connecting a power adapter after the laptop has hibernated won't help, it has to be connected before standby/hibernation
3. Enable the wake option via the power management section of the wireless adapter
4. In the BIOS, enable Wake on WLAN.
5. Note down the MAC address of the wireless adapter
6. I don't use the Intel software as the Windows wireless already has the 'persistent connection' but this also needs to be setup if you stay with Intel's software.
7. Use a third party tool such as this one - http://www.depicus.com/wake-on-lan/wake-on-lan-gui.aspx
8. Run the tool from the local subnet. Type in the MAC address, leave the internet address blank and set the mask to 255.255.255.0 and the port to 7. You can't run the tool from outside the subnet (including via VPN) without additonal configuration. Create a web app that sits on an internal server to get around this