▁compet ing ▁system , ▁P AL , ▁became ▁available ▁and ▁was ▁eventually ▁adopted ▁by ▁the ▁G PO ▁for ▁use ▁on ▁the ▁ 6 2 5 ▁line ▁service , ▁to ▁be ▁known ▁as ▁System ▁I ▁or ▁P AL - I . ▁ ▁Broadcast ▁on ▁this ▁system ▁officially ▁comm enced ▁in ▁ 1 9 6 7 ▁with ▁BBC 2 ' s ▁( and ▁the ▁UK ' s ) ▁launch ▁of ▁colour ▁television ▁programming , ▁though ▁previous ▁years ▁had ▁seen ▁many ▁uno fficial ▁colour ▁test ▁films ▁outside ▁of ▁official ▁broadcast ing ▁hours , ▁including ▁some ▁which ▁tri alled ▁N T SC ▁and ▁SE C AM . ▁BBC 2 ▁was ▁joined ▁in ▁ 1 9 6 9 ▁by ▁BBC 1 ▁and ▁the ▁main ▁I TV ▁franch ises ▁( the ▁rest ▁following ▁in ▁stages ▁into ▁the ▁ 1 9 7 0 s ). ▁Both ▁BBC 1 ▁and ▁I TV ▁continued ▁to ▁broadcast ▁simultaneously ▁on ▁the ▁V H F ▁system ▁A ▁until ▁ 1 9 8 5 ▁ ▁N IC AM - 7 2 8 ▁Digital ▁s tere o ▁ ▁Without ▁affect ing ▁the ▁definition ▁of ▁the ▁" P AL - I " ▁system , ▁the ▁UK ▁also ▁used ▁a ▁digital ▁s tere o ▁comp and ing ▁system ▁on ▁analog ue ▁terrest rial ▁television ▁called ▁N IC AM . ▁Stand ing ▁for ▁Near ▁Inst ant aneous ▁Comp and ed ▁Audio ▁Multi plex ▁and ▁used ▁for ▁digital ▁s tere o ▁TV ▁broadcast s ▁to ▁the ▁public , ▁it ▁used ▁the ▁N IC AM ▁digital ▁audio ▁system ▁used ▁since ▁the ▁early