** British bank's U.S.-listed shares down 2.2 pct at$15.73 premarket
** Takes Q4 charge of 750 mln stg ($1.2 bln) to settleallegations its traders manipulated foreign exchange markets
** Pretax profit falls 21 pct to 2.3 bln stg
** Increases litigation provision by 250 pct to 1.7 bln stg
** Has been providing information to an investigation intoprecious metals by the U.S. Department of Justice, bank says inannual report
** Bank's U.S. shares had fallen 5.5 pct in 12 months
($1 = 0.6516 pounds)