Is the seller a dealer? If so, explain to him that to move forward with the purchase you want these MOT advisories acted on. Meaning you want the corroded brake pipes replacing, and the rear tyre replaced and four wheel tracking done. A good dealer would do these jobs to clinch a sale. If its a private sale, getting the car checked over professionally is an option, getting quotes for the work is an option, knocking big chunk of money off the asking price is an option.