Royal Wedding Souvenir Hunt

April 26 (Bloomberg) -- The April 29 royal wedding has flooded London with tea towels of Prince William and Kate Middleton, dinner bells, ashtrays, T-shirts and mugs. The marriage could add as much as 620 million pounds ($1 billion) to the economy in tourism revenue and sales of food and drink, according to Verdict Research, a retail analysis unit of Datamonitor Plc. (Source: Bloomberg)