If it's helpful, here's the copy of the brochures I saved back in early 2018 which I think covers spec from autumn 2017 onwards. The main difference from earlier 2017 cars was a newer infotainment system, most of the rest was carried forward IIRC.
It is possible to find a later GTE estate under £40k luxury tax limit (I did exactly this for financial reasons when picking my company car as I intended to buy it at the end of the lease), but you only got to choose a handful of options to keep the price down. Essentially it boiled down to either dynamic LED headlights, metallic paint or Active Info Display, plus a little budget left for one other cheaper item like reversing camera.
It is possible to find a later GTE estate under £40k luxury tax limit (I did exactly this for financial reasons when picking my company car as I intended to buy it at the end of the lease), but you only got to choose a handful of options to keep the price down. Essentially it boiled down to either dynamic LED headlights, metallic paint or Active Info Display, plus a little budget left for one other cheaper item like reversing camera.