The issue here is that the term 'good history' does not specifically reference the car's MoT history. It may have a good service record, which could be argued is a good history. MOT advisories are undesirable, but it is also true that a vehicle can have MoT advisories for many years and still pass an MoT test first time.

Unless the dealer made specific reference to there being no MoT advisories and you can demonstrate this, it would be difficult to argue that the car was not as described. It is also the case that the MoT history of a vehicle is publicly available, so the emphasis is on the buyer to check the history of a vehicle rather than the dealer to disclose information that is already available.