Meanwhile, the PML-N also shared a video on its Twitter timeline showing the last conversation between Nawaz Sharif and his ailing wife before the former departed for Pakistan. Referring to her mother's reign as PML-N chief, daughter Maryam once said that her mother had dauntlessly challenged a usurper when "most men did not". PML-N president Shehbaz Sharif will be proceeding to London to bring Kulsoom's body to Pakistan. Her body will be brought back to Pakistan on the first available flight for burial.
Nawaz, Maryam have been serving time in Adiala Jail, Rawalpindi after an accountability court ruled that they had assets beyond known income.
She won a by-election to the national assembly seat, vacated by her husband's disqualification in a Panama Papers case verdict past year in July, from her hospital bed in London. "May God rest her in peace", Shehbaz Sharif, the former prime minister's brother, said on Twitter.
Kulsoom belonged to a respected Lahori family of Kashmiri origin.
Her first direct exposure to the harsh political landscape of Pakistan came in October 1999 when her husband's government was toppled and he was imprisoned.
Nawaz took over leadership of the party, defying house arrest to attend street rallies standing up to military dictator General Pervez Musharraf and demanding her husband's release. He said in case the family decides to bury her in Pakistan, the repatriation process may take two or three days.
In September that year, she handily won that by-election, beating out the Pakistan Tehreek-e-Insaf's (PTI) Yasmin Rashid, despite not being able to campaign.
Sharif was ousted from the premiership a month before his wife's diagnosis. She led defiant, lonely protests against the Musharraf regime to get her husband freed from prison.
He has directed the Pakistani High Commission in London to assist in provision of all necessary facilities to the heirs of the deceased.
There was some initial criticism of the PML-N leadership by those who saw the trip overseas as evidence the party was taking its voters for granted.
Politicians from various political parties and high-level government officials also expressed deep grief over the death.
Offering his condolences to the bereaved family, the PPP leader termed the demise a great loss.