According to sources, the NAB team will board the plane with the permission of authorities and will take Nawaz and Maryam under their custody.
Meanwhile, before leaving for London's Heathrow Airport, Nawaz told media-persons that "this is the worst situation which has never been observed even in the Martial Law era."
On July 6, Nawaz was sentenced to 10 years of imprisonment, and a fine of eight million pounds was slapped on him in the Avenfield Reference case.
The case pertains to the purchase of Avenfield apartments through offshore companies, the beneficial owner of which was Maryam.
Maryam was sentenced to seven years of jail and fined two million pounds, by the Accountability Court.
Earlier in April, Pakistan's Supreme Court disqualified Nawaz from contesting elections for the rest of his life because of his corruption cases as revealed in the Panama Papers.
Sharif had resigned in July after the apex court's ruling.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)