Possible Clues:

• The capital and largest city of Croatia
• Change of direction regarding Britain in EU capital
• City backed series in October Gazette
• City series in October Gazette backed
• Capital letters at either end on short flyer
• Ending in Vaduz, a tailless bird in European capital
• The last world capital, alphabetically
• S.A. Hill gets map to go all around European city
• Six in number, gazing round European city
• A-Z returned to German concerned with British capital