CNBC Daily Open: London markets didn't seem to view the U.K.-U.S. trade deal positively

The U.K. is the first country to seal a trade deal with the U.S. Cue the jubilations. And investors certainly did, giving the three major U.S. indexes back-to-back winning sessions. Curiously, the mood across the Atlantic wasn't as upbeat: the U.K.'s FTSE 100 closed lower following the…