Possible Clues:

• Capital of UK abandoned in part going all the way back
• The neighbour's leaders assisting banks all up in The Capital
• Azerbaijan’s capital
• Blackout sees regulars leaving for capital
• Originally, banking authority kept using capital
• Starts to believe as King unites capital
• UK sailor turning up in foreign capital
• British sailor returning to port
• Footballer, about to be dropped by United or City
• British sailor heading west for port city