Comparative advertisement, where the advertisement identifies - either plainly or by implication - a competitor or their goods or services, is allowed, but only if it is not misleading and meets a number of other conditions. It must compare goods or services on a like-for-like basis; objectively compare representative features of those goods and services, which may include price; it does not create confusion in the market regarding the identity of the advertiser and its competitors. This includes matters such as competing trademarks, trade names, goods or services; it does not exploit the reputation of a trademark, trade name, etc, of a competitor or of the place of origin of competing products; it does not present goods or services as imitations or replicas of goods or services bearing a protected trademark or trade name. When a comparative advertisement refers to a special offer it must also include further information in a clear and unequivocal way. That includes the date on which the offer ends or, where appropriate, the period during which the special offer applies. The Office of Fair Trading has extensive enforcement powers but cannot act on issues of taste or decency.