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This is one of those never-likely-to-be-really-solved-and-keep-everyone-happy things. 1980s onwards Vauxhall/Opel twins such as Astra/Kadett (and most of their other models. And most Fords...) were churned out in both GB and D in great numbers, and often supplying each others markets. So for instance when I had a tour of Luton in early 90s, there were RHD and LHD Vauxhall Cavaliers and RHD and LHD Opel Vectra twins all coming off the line (there's a page on the main site here with longer discussion, and others dotted around). Plus there were factories in Belgium and Spain which sometimes diverted supplies into the mix, according to whatever production directive was passed down the line for that month .....
Most of these projects were jointly shared GB-D design projects in the early Marks, but gradually became increasingly D designs with tokenistic GB input, but this was a gradual osmosis, not a defined before/after threshold.
Some particular versions were only ever built on one site, so for instance all estate/sportwagon Astras and Kadetts in newer Marks this century (I haven't checked dates while writing this) were only made at Ellesmere Port, and maybe all GTE/GSi sporty things were built in D, and most vans from GB (again haven't checked). But there isn't much else solid to go on.
So - yes it's a bit of a mess. But not an easy one to mop up neatly ....
Edit - this comment sums it up from the linked page above
Most of these projects were jointly shared GB-D design projects in the early Marks, but gradually became increasingly D designs with tokenistic GB input, but this was a gradual osmosis, not a defined before/after threshold.
Some particular versions were only ever built on one site, so for instance all estate/sportwagon Astras and Kadetts in newer Marks this century (I haven't checked dates while writing this) were only made at Ellesmere Port, and maybe all GTE/GSi sporty things were built in D, and most vans from GB (again haven't checked). But there isn't much else solid to go on.
So - yes it's a bit of a mess. But not an easy one to mop up neatly ....
Edit - this comment sums it up from the linked page above
Quote From: Sunbar
The export market RHD Opels and specifically Vectras were commonly built in Opel plants in continental Europe, as well as in Luton, in similarly high volumes. The flexibility of GM-Europe plants, certainly up until the Luton car plant closed, had the objective that all plants building a certain car line Vectra, Astra etc. would build both Vauxhall and Opel variants. Likewise RHD and LHD versions were built in the UK and continental Europe without any local bias. That was more than the Vauxhall or Opel badges as the trim level contents also differed; the Opels tending to be lower spec'ed than the equivalent Vauxhall so the Opel needed various add-on options to achieve the same result.