Possible Clues:

• Cross the Thames here in armour in the dark?
• Affluent London district
• Participants in chess game in central London area
• London area south of Hyde Park
• Corrupted disk? Bring the head in from Google (London area)!
• Players join card game somewhere in London
• Men on board captain's place on ship -- posh area
• Fashionable London area, 'south of the Park'
• In central London, stop men going on the game
• Men crossing area in London