In fairness, that's the RS2000 which is definitely not a regular ford escort. An ordinary 1980 ford escort isn't worth anything like that much. Maybe 1/10th of the price if in really good condition.
Even the boring models command ridiculous values now: https://www.classiccarsforsale.co.uk/ford/escort/351743
For £6750 you can have one in really bad condition and with the steering wheel on the wrong side: https://www.ebay.co.uk/itm/234972695631