In the United Kingdom, what Americans refer to as "English muffins" are simply known as "muffins." The term "English muffin" is mainly used in the United States and Canada to differentiate them from the sweeter, cake-like muffins that are more common in North America.
In the UK, a "muffin" typically refers to a round, flat, and yeast-leavened bread product, similar to what Americans and Canadians would call an "English muffin." British muffins are often split open, toasted, and served with butter or jam for breakfast or as a tea-time treat. They have a slightly chewy texture and are delicious when enjoyed warm and freshly toasted.