Patch49, have you identified the attributes of 23 which link to those locations? If so, you are looking for a pair of names who shared each attribute with 23 in the respective locations.
Happy new year to all! I have the identity, the attribute -sharers and all answers apart from 10 down; a nudge in the right direction for that would be most appreciated.
Happy New Year. The extra letter is in the fifth word, and “mark as region” should be treated as a verbal phrase, four letters surrounding the usual “one”
Re the ambiguity mentioned above, for what it's worth I thoight it safe to go with the 2 locations whose letters total 16 (matching the characters in clues).