In the United Kingdom people have a diferent tradition of tipping. In the United Kingdom, differently to most of the countries of America, people there only give tips when the service is good, and it is common to be the 10% of the bill, for example in elegant restaurants, while in the United States a 15% of the bill (or more) is common, for example. In the United States most people even give tips when the service is not very good which in my opinion is not good. You should only give tips when the service is good, and it shouldn’t be an obligation, but it would be impolite not to leave a tip when the service is good enough. In conclusión, the tips are a polite way of thanking someone when the service is good.
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