Possible Clues:

• London thoroughfare
• Capital way in which kings' representatives negotiate, we hear
• Powerful man having his way in London?
• Central London thoroughfare
• London shopping area
• London shopping thoroughfare
• Temporary ruler having his way in London
• Soldier takes time touring chap's plant in London
• London thoroughfare originally laid out by John Nash
• Comfort stations for man and dog in wet thoroughfare