If you go on the configurators for the German market, you will find you are able to select things like heated seats separately on may models, but when you compare the list prices you may find that the German car is still dearer than a UK market car with an option pack, I just made an X1 s18d X line with some packs on the UK site come to £37,685.00, the same spec on BMW.de is 52.430,00 €, that is £45,922.39 at todays exchange rate.
I guess the manufacturers are trying anyway they can to make up for the pound we devalued in 2016, and which also caused the market uncertainty. I guess it will be a different story if we go back to the tariffs we use to have, and warranties won’t be valid so we will have to buy off the official importer.