How to buy wine, from Alexander McCall Smith's Corduroy Mansions:
The late-afternoon customers sometimes sought his advice not only on what wine to choose but as to whether or not to take a bottle to their hosts at all. The issue was a delicate one, and William had toyed with the idea of printing a small leaflet that would explain the etiquette of such matters – at least as he understood it.
"The most important thing," he would say, "is to do whatever you do with good grace. If you take a bottle with you, never present it apologetically. There is nothing worse than people who hand over a bottle of wine to their hosts with a look bordering on resentment – as if they were paying the taxman his dues.
"But, of course," he would go on, "the real issue is whether you have to take a bottle of wine with you or not. There is no strict ruling on this matter – as indeed on any issue of etiquette; what counts is attitude. The most terrible apparent breach of etiquette can be carried off by one who means well and is charming about it. But for most of us, charm will not suffice – in that we don’t have enough of it – and we therefore need rules. Here are some: "If you are a student and you are invited to a meal or a party at another student’s flat, there is absolutely no doubt that you must take a bottle of wine with you. If you do not do so, then the host is perfectly within his or her rights not to let you in. This is an absolute rule and cannot be avoided by saying that your friend, who is coming later, will be bringing a bottle for you. Most hosts have heard that line before and will not believe you.
"Students should not bring good quality wine with them as to do so will be seen as elitist and arrogant, and will imply that you do not approve of whatever your host will provide. This rule does not apply if you can explain that you took the wine in question from your parents’ stocks while they were away. That is perfectly acceptable in today’s dishonest climate.
"In my own day, the correct thing for students to take to a party was a cheap Spanish wine or, if flush with funds, Mateus Rosé, distinguished by its squat oval bottle, which can later be turned into a lamp stand or candleholder. This wine can occasionally be found in the back of parental cupboards and may be circulated at dinner parties without ever being drunk, in the same way as boxes of out-of-date After Eights do the rounds, like bankers’ negotiable instruments never presented for payment.
"If you are no longer a student, you should nevertheless continue to take a bottle of wine when invited for dinner unless the invitation comes from people who are much older than you. As far as friends of equal age are concerned, you should take a bottle of wine with you until you have all celebrated your fortieth birthday. After that, you must assume that your hosts will be in a position to entertain you without assistance.
"It is never wrong to take a bottle of champagne, even to a host who is well off. If the host is not on the breadline, this should be in a presentation case; it should never be taken chilled, as that implies that his own supplies of champagne will be exhausted and recourse may need to be made to the bottle you brought with you.
"In no circumstances is it polite to take away with you the bottle that you brought if it has not been consumed at the table. It is also impolite to say at the end of a meal, ‘I hope that you enjoy the wine we brought.’ That is not a friendly comment, and will be interpreted accordingly. Nor, as a host, is it polite to examine the label of a bottle brought by your guests. If you do, always misread the vintage, saying, for example, of a 2007 Bordeaux, ‘Ah, 2001. What a treat.’"
