Studge, just read your project thread, if you have FRP management, then I think you must have a TAPE ECU, which as mentioned above, doesn't use the second lambda. IIRC you can't load the FRP map onto either the DIVE or QQPI management fitted to the twin lambda cars.
To find out, you could either check the lambda readings with your software (not sure on this, by the Snap-On code reader at a relatives garage would give real time lambda readings, so your software may also be able to do this), or just unplug the blue lambda and see what happens. It can take a while for the MIL to come on, for me, it was upto about 300 miles.
Also, when you turn on the ignition, does the MIL come on for a few seconds until you start, or does it just flicker once?