Sometimes, more often in London than in other areas, or at expensive restaurants, a service charge may be included in the bill, or added separately. 12.5% is reported as a common amount. Since it is a legal requirement to include all taxes and other obligatory charges in the prices displayed, a service charge is compulsory only if it is displayed, or the trader makes it clear verbally, before the meal. Even so, if the level of service is unacceptable, and in particular it falls short of the requirements of the Supply of Goods and Services Act 1982, the customer can refuse to pay some or all of a service charge.