Tipping a tour guide in the United Kingdom is not a strict requirement, as it is in the United States, but it is a widely appreciated gesture for excellent service. For a standard walking tour (such as a "free" tour or a group city tour), a tip of £5 to £10 per person is considered very generous and appropriate. If you are participating in a full-day coached excursion or a more specialized private tour, a tip of 10% to 15% of the total tour cost is a standard way to show appreciation. For drivers on long-haul tours who are separate from the guide, a smaller tip of £2 to £5 per day is common. It is important to remember that most guides in the UK are professionals who earn a base wage, but many in the "free tour" sector rely almost entirely on these gratuities to make a living. Unlike in restaurants where "service charge" is often added to the bill, you will usually need to provide this tip in physical cash at the end of the experience. If you find the guide was particularly knowledgeable, engaging, or went out of their way to assist with local recommendations, leaning toward the higher end of the scale is a polite way to acknowledge their expertise in a country where tipping culture is present but generally more reserved.