British Etiquette

As the days become closer I can't help but think how I can try and blend in more, and not look so much like a tourist.  I decided to look up the etiquette of the British, this is some of the things I came up with.  Depending on the social class, norms are a little different, but hand shakes should not be to firm and kiss friends on the cheek.  Postural norms are leaning forward to show interest and crossing legs when relaxed.  Smile and nod to encourage conversation, and speaking loud or attracting attention to yourself is looked down upon, staring is impolite, and not waiting in line is a huge social blunder.  The conversation the British are known for their understatement both in humor and in other forms of expression.  On social occasions, small talk is neutral topics is appropriate and modest gifts are given, buying rounds of drinks and food as an example.  In bars it is not appropriate to gesture for service, but you can not get a refill without asking for one.  Tips are between 10 and 15 percent.  Standard table manners include holding the fork in the left hand and the knife in the right hand, and no elbows on the table.