Possible Clues:

• River
• Sam Weller's face doesn't appear with a message
• It flows from the Cotswolds into the North Sea
• River by Windsor Castle
• A flower with a message for you to read
• River flowing through London to the North Sea
• River past Westminster Palace
• One can lose a lot of wealth: a message for banker dividing capital
• Not wild about hour taken by southern river
• 'Sweet ___, run softly, till I end my song': Spenser