Possible Clues:

• London street joining Trafalgar Square to Buckingham Palace
• Grassy area near the Capitol
• That lot joining everybody in London thoroughfare
• London thoroughfare not entirely blessed by Vera Lynn?
• Teen hangout
• Street between Trafalgar Square and Buckingham Palace
• Once you've seen one shopping centre, you've seen Buckingham Palace's approach
• Article on shopping centre in London
• Everyone follows those people in London street
• See 1