FTSE marks third straight day in the red

(Reuters) - London's FTSE 100 recorded its longest losing streak since early December as a strengthening in sterling triggered by strong manufacturing sentiment data weighed on dollar earners, while travel group TUI slid on more Boeing woes. The main index reversed earlier gains to decline 0.5% on its third consecutive day in the red.Homebuilder Berkeley limited losses on the index, jumping 5.4% to a record high after plans to return 450 million pounds more to shareholders. An index of..