The spectacular high-level walkways of Tower Bridge will be transformed into an exquisitely romantic setting with sweet scented flowers, seductive lighting and live music performed by a harpist.
Couples can enjoy amazing panoramic views of the City as they sip pink Champagne and nibble on chocolate truffles.
"Tower Bridge - floodlit - is romantic enough," says bridge master Eric Sutherns, "but the Valentine's view from inside seems to sweep people off their feet. Proposals are often made and celebrated in these walkways."
Lovers who decided to take the plunge and propose on the evening will be entered in a prize draw to win free venue hire for their wedding reception at Tower Bridge worth Â£4,500. The winner will also receive furniture, security and Â£500 of LED lighting to colour theme the venue.