In car fridge freezer

Hi all got a 40l Engel fridge freezer, used to live in my 110 but is now surplus to requirements. Its not a cheap halfrauds type one but a proper overlander type and will chill down to a real -18 degrees c in anything up to 50 degrees c plus ambiant temp. Anuway its 40litre capacity and shaped like a cool box. can be run off 12 or 240v (i have both leads). It cost me £300 and a bit new. Its well used but in perfect working order. The only thing worthy of comment is that the top is a bit scratched due to having things on top in the back of the car.
Open t offers based on say.. £180?
I'm in Dorset.
Joe