▁Har low . ▁▁ 2 0 0 0 : ▁Gla x o ▁Well come ▁and ▁Smith K line ▁Be ech am ▁mer ger ▁Gla x o ▁Well come ▁and ▁Smith K line ▁Be ech am ▁announced ▁their ▁intention ▁to ▁merge ▁in ▁January ▁ 2 0 0 0 . ▁The ▁mer ger ▁was ▁completed ▁in ▁December ▁that ▁year , ▁forming ▁Gla x o Smith K line ▁( GS K ). ▁The ▁company ' s ▁global ▁headquarters ▁are ▁at ▁G SK ▁House , ▁Br ent ford , ▁London , ▁officially ▁opened ▁in ▁ 2 0 0 2 , ▁by ▁then - Pr ime ▁Minister ▁Tony ▁Bla ir . ▁The ▁building ▁was ▁ere cted ▁at ▁a ▁cost ▁of ▁£ 3 0 0 mill ion ▁and ▁ ▁was ▁home ▁to ▁ 3 , 0 0 0 ▁administrative ▁staff . ▁▁ 2 0 0 1 – 2 0 1 0 ▁ ▁G SK ▁completed ▁the ▁ac quisition ▁of ▁New ▁Jersey - based ▁Block ▁D rug ▁in ▁ 2 0 0 1 , ▁for ▁. ▁In ▁ 2 0 0 6 , ▁G SK ▁acquired ▁the ▁US - based ▁consumer ▁health care ▁company ▁C NS ▁Inc ., ▁whose ▁products ▁included ▁Bre at he ▁Right ▁nas al ▁stri ps ▁and ▁F iber Choice ▁di et ary ▁supp lement s , ▁for ▁US $ 5 6 6 mill ion ▁in ▁c ash . ▁ ▁Chris ▁Gent , ▁previously ▁CE O ▁of ▁V od af one , ▁was ▁appointed ▁chairman ▁of ▁the ▁board ▁in ▁ 2 0 0 5 . ▁G SK