RAWALPINDI: As former prime minister Imran Khan faces a jail trial in the £190 million corruption case, former Khyber Pakhtunkhwa chief minister Pervez Khattak arrived in Adiala Jail on Wednesday to testify against him before an accountability court. Before he parted ways with the PTI to form the now-defunct PTI-Parliamentarians in the run-up to the Feb 8 polls, Mr Khattak was a key …