You must be very new to trading - the average 8-10 yr old car starts to look horrible underneath so as for a 14yr old Micra I’d honestly be more surprised if it wasn’t fucked.
To put it simply, at 14yr old it’s beyond it’s life expectancy. If you’re buying cars like that you MUST see them yourself. The place to buy 14yr old snotters is NOT from auctions - tbh their fees are more than the average old banger is worth.
Also, I’m afraid expecting the auction house reports to put them on a ramp & give you a full, honest & in-depth appraisal is optimistic to say the least.