If you order 'tea', you'll definitely get the hot variety. Alcohol consumption is extremely common. Some people do choose not to drink, but they are more unusual than those who do. One local favorite here is a food called Yorkshire pudding. Puddings in general are very different from the U.S. variety.
Pudding here is usually a cooked, sweet dish, with a cake-like texture.
What we're used to calling pudding is commonly referred to as 'Whip'. Avoid eye contact with strangers, particularly in public areas. Making eye contact on the street, for example, is normally viewed as either threatening or rude. Always watch the volume of your voice in public. Weight is typically measured in stones instead of pounds.