For instance,we buy loads of Champagne.Are the froggies going to pour it down the drain rather than have a chat about the new price????
Why would we stop buying French Champagne? We cannot produce enough wine to meet our own requirements, therefore we would want to or need to import wine........from somewhere. Why not France?
But that does not mean that we can demand that it is sold at a price of our choosing.
But your example is a typical nonsensical comment. About half or more than half the price of a bottle of wine is UK tax, whether it is imported wine or home produced wine.
I honestly fail to see how Brexit will have, or can have any affect on whether we buy wine from France, or whether they want to, or are willing to sell it to us.
They same applies to cars from Germany, cheese from Switzerland, beer from Belgium, meat from Ireland, fruit from Spain, etc.
You could argue that these EU countries will have to compete on price with other exporting countries. But price is not the only criteria.
Do you prefer US beer, or Belgium beer?
Do you prefer Korean cars, or German cars?
Do you prefer Argentinian fruit, or Spanish fruit?
Do you prefer Irish meat, or Venezuelan meat?
etc.
Is it cheaper to import meat from Ireland, or Venezuela, cars from Germany or Korea, beer from US or Belgium, wine from France or Australia, etc?
The consumers will decide.