I know marketing is a tough game, but the following phrase 'Spink 2017 values at £375 in UNC condition no value given for Choice UNC-BU' is drivel. Spink don't list a value for choice unc-BU because there is no column with said description against which to post a value, and in any case, one man's choice BU is another man's ok or even a dog.
The world expends and wastes vast amounts of energy trying to polish turds. Cut it out and you could reduce global warming.