Here's a short summary in simple English:
The British are polite but rather reserved. A handshake is common when you meet someone for the first time; kissing or hugging is only for close friends or family. They may call you affectionate names like dear, mate, guv, or love, and this is normal. For small talk, chat about family, films, TV, sports, studies, food, hobbies, and the weather; avoid asking about age, religion, politics, marital status, weight, or how much money someone earns. They value privacy, so some topics are not safe for conversation. When you visit, be on time and bring a small gift like flowers or chocolates; you should phone before visiting, and hosts may say “come and see me soon” or “drop in anytime.”