Thanks to McGrath of Harlow for the official definition of 'cultural uniqueness' given above.

But I'm not sure I agree with McGrath's assessment: looking at the definition, if someone's "style of artistic expression" is unique to that person, then surely they must be "unique to a particular country, nation, society, class, ethnicity, religion, tribe, or other group of persons"? It doesn't say the person has to be representative of the country, nation, etc.

This just reinforces my own view that 'cultural uniqueness' has b*gg*r all to do with the decision (as also alluded to in the letter above).