The question here is whether not telling you about the MoT advisories is construed as a 'Misleading Omission' under the 2008 CPRs: The Consumer Protection from Unfair Trading Regulations May 2008 (CPRs) incorporate The Sale and Supply of Goods to Consumers Regulations 2002 and contain a general prohibition against unfair commercial practices and, in particular prohibitions against misleading actions, misleading omissions and aggressive commercial practices. The Regulations are enforceable through the civil and criminal courts. The CPRs create an offence of misleading omissions which would not previously have been an offence if the consumer had not asked the right questions. So if a salesman knows a car has, for example, been badly damaged and repaired and does not tell the customer, he could later be held liable if the customer subsequently discovered that the car had been damaged and repaired. Make the dealer aware that you are aware of the 2008 CPRs. More: www.honestjohn.co.uk/faq/consumer-rights/