I am pretty sure an FL D2 won't pass the age-appropriate appropriate emissions test without cats - I've tried it. Big Red (2002) has the pre-cats only which keep the ECU happy, but needs to be roasting hot to pass just barely within spec without the main cats. Ditto Mike's 4.2 Allroad (2005?), which also has pre-cats so no EML, but empty cans for the main cats. That missed the limits by a sizeable margin IIRC so we're fitting some Magnaflow E-marked cats to it before its MoT. Both of those engines are in good health and running well.
An early PF might pass without cats I guess, although I think it still supposed to have them.
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