https://www.pistonheads.com/classifieds/used-cars/ac/ace/ac-ace/8618663
... maybe "corrosion around the body panels" explains the price... Good with honest advertising, don't see it so often.
/Paho
This is a little more encouraging, including buyers premium just over £28k but in my opinion still cheap for a good example.
https://www.classiccarauctions.co.uk/1995-ac-brooklands-ace
1995 AC BROOKLANDS ACE LOT: 393
Sold for (£): 25,300
Offered for sale is a 5.0L 1995 AC Brooklands Ace manual that has been with the current owner for the last year. Coming with an extensive history file, this lot's condition scores an impressive 108 / 135.