We have the largest 'buying' capacity in the EU.
Wow. I did take a moment to read this, and speaking as someone with a professional interest in this sort of thing, it is utter bollocks. I am not by the way posting to enlighten Caroline (waste of time) but because a lot of people read this thread and it is worth spelling out why this "but German car manufacturers!" (for her post is but a variation on this tired old theme) argument is wrong.
The UK is a rich country. No one is arguing this. But those riches are not spread out equally. It is also one of the more unequal countries in Europe in terms of personal wealth, partly because of the distorting effect of London and in particular the housing market, partly because unlike some other European countries the UK is allergic to taxing assets and income from assets.
Housing assets form part of personal wealth, but cannot be spent: I have friends in London who are paper millionaires but do ordinary jobs. They are not in the market for BMWs. I am sure that all of us know people in a similar situation - asset rich but cash poor.
The UK does also, of course, have a very large number of individuals with significant spending power, and that makes us an attractive market for the EU. But even German car makers recognise that this economic question has political ramifications. It is of little value to BMW if they keep their UK clients but kill the goose that laid the golden egg (the goose being the EU and the golden egg being tariff and NTB free access to a market of 600 million consumers, plus FTAs with several other large economies).
It goes without saying that the EU wishes to retain easy access to the UK market, but like all things this has a price and the negotiations will determine what price both sides are prepared to pay. So far the EU is playing hard ball (it has previous form, and if this were a tennis tournament the EU would be number one seed) and it is very hard to see what would make it back down, because while losing ready access to a market of 60+m consumers is unattractive, the alternatives are far worse.