Kate!!! STOP.
First of all, the old Igniters plays out NTSC DV 720x40 to your monitors just fine. You just need to turn off Mirror To Desktop.
Secondly, what broadcast standard are you using for your show. If it's NTSC and you're in London, then why are you using NTSC? If you're using PAL, then you should be capturing standard DV PAL at 720x576. If this a movie being cut at 24 or 23.98, then you should probably be using FCP's 25@24 scenario for PAL users.
Could you give a little more info on your project?
The Igniter is an old card that was designed back in 1998. This was before there was a FCP and QT was at version 2.5 or 3. There are more modern cards with a more robust PCI architecutre from both Aurora and other companies that might work better for you.