 Unable to perform his duties as the leader of the Community without violating the Ordinance, Mirza Tahir Ahmad, the fourth Ahmadiyya caliph was compelled to leave Pakistan and migrate following its promulgation.He left with his immediate family and 17 other Ahmadis for London on 29 April 1984, eventually moving the headquarters of the Community to London during his years of exile.Ordinance XLIV of 1980 attempted to address the same issue without specifically naming the Ahmadiyya.