I wouldn't want to take your thread off subject, this isn't Range Rover related but may be of interest because it is ULEZ related...
I convert a lot of imported Nissan E51 Elgrands to LPG, a people carrier with a 2.5V6 or (much more often) 3.5V6 engine, they're mostly 2002-2004 (series 1), 2004 - 2006 (series 2) and 2006 - 2009 (series 3) model years. If the owner of a 2006> model applies for ULEZ exception they're usually granted it straight away but if the owner of an earlier model applies they may be granted it straight away or they may have to appeal many times before (hopefully) being granted the exception.
Because they're imports the V5 doesn't usually have the emissions data but all model years have the same engine and emissions.
Nissan won't help provide the emissions data that ULEZ usually ask for. so the only thing that owners of pre 2006 models can do is point out that they're all the same mechanically and point out that there's a precedent for these vehicles to be ULEZ compliant because ULEZ recognises straight away that post 2006 models are compliant.
Owners of pre 2006 models are using a carefully formulated initial application and (where necessary) carefully formulated appeals letters which they continue to refine, yet still some are granted exception straight away while others have tried many times and are still told the vehicle isn't ULEZ compliant... I reckon it sometimes comes down to whom at ULEZ processes the application / appeal. Most contact with ULEZ gives the impression of computer generated auto-replies.