That's a good point iLard

I've seen some instances where the "supposedly" younger 17 plate car according to the registration date is a MY16 and the "supposedly older 66 plate car is a MY17

The only definitive way is to try and get hold of the VIN number when the new MY cars were being produced. Everything else just depends on knowing the detailed changes between model years. Some are easy to spot, like the centre infotainment screen change between MY16 and MY17. 2021 D350 Fifty Edition - Carpathian Grey
2017 4.4 SDV8 Autobiography (2021-2024) - Santorini Black
2012 4.4 TDV8 Westminster (2016-2021) - Santorini Black

Entering the VIN on https://osh.landrover.com/ will tell you the model year. Entering it on www.vindecoderz.com will give you a lot of extra information.

Here is a sample with my VIN:https://www.vindecoderz.com/EN/check-lookup/SALGA2KFXGA247533 RR's that are part of my car timeline since I bought my first RR Classic in 1999:

On the waiting list for the RR EV MY2025

RR D250 Autobiography MY2023
RR P510e Autobiography MY2023
RR P530 LWB First Edition MY2023
RR EVOGUE Cabrio MY2017

RR P400e Autobiography MY2020

RR TDV6 Autobiography MY2016
RR TDV6 VOGUE MY2013
RR TDV8 VOGUE MY2009 & MY2006
RR TD6 VOGUE MY2004

RRC 3.9i VOGUE MY1994 & MY1992

Nice one teeleh, that does the job  2021 D350 Fifty Edition - Carpathian Grey
2017 4.4 SDV8 Autobiography (2021-2024) - Santorini Black
2012 4.4 TDV8 Westminster (2016-2021) - Santorini Black