I found that the country of residence in the PSC resource does not necessarily match any of the values from the Geographical names list (https://www.gov.uk/government/publications/nationalities/list-of-countries).
E.g. /company/07209813/persons-with-significant-control gives
while "Usa" is not present in the Geographical names list. Does this mean that this is a free text where companies are allowed to submit virtually any value?
Does the same apply for nationalities?