Permission is also needed from the Department of Justice before an exhumation can be carried out.
Mr Balkwell's father Les told BBC News the exhumation at Upminster Cemetery was "a necessary evil".
BBC: Exhumation of Lee Balkwell in concrete mixer death probe
An exhumation of the Upton family burial plot in January did not find Moira's remains.
Authorities are hoping to use the exhumation to determine how the cyanide entered Khan's system.
"In this case, due to advanced putrefaction of the tissue, no cyanide was detected" after the exhumation.
CNN: Autopsy: No more clues on how lottery winner was poisoned
Her widower, Asif Ali Zardari, has said the family was against exhumation because it did not trust the government.
Following an exhumation last year Ms Kamara's body was discovered in Mr Alder's grave in the city's Northern Cemetery.
In a statement, it said it had been informed by the authorities of the exhumation plans a few days ago.
BBC: Chile judge orders exhumation of Pablo Neruda's remains
The exhumation is expected to occur Thursday, CNN affiliate WGN reported.
Last month, a court in Chile set a date for the exhumation of Neruda's remains as part of an inquest into his death.
John Gibbons, a spokesman for the family, said it is the family's wish that all details of the exhumation and reburial remain private.
"We are against an exhumation of his cadaver because it would seem to us a true act of desecration, " Juan Agustin Figueroa said.
Three families are hoping the exhumation of a burial plot in North Lanarkshire can lay to rest a 55-year-old mystery over a missing schoolgirl.
Before the exhumation, Cina said that cyanide can evaporate from a body after death and that it was possible it would not still be present.
CNN: Autopsy: No more clues on how lottery winner was poisoned
However, Mr Fox said an exhumation was a matter solely for Savile's family and they had made it clear they did not want his body removed.
One of Khan's brothers and a Muslim cleric were present at the exhumation at Rosehill Cemetery, along with officials from the medical examiner's office and Chicago police detectives.
But Ken Wiwa, son of the writer, has insisted that all the families were consulted, and that the offer of exhumation by the PHR team was "warmly received".
The date of the exhumation has not been fixed yet.
BBC: Chile judge orders exhumation of Pablo Neruda's remains
But the foundation's leader told Radio Bio-Bio this week that the organization opposed the exhumation because they did not believe there was a "third party" involved in Neruda's death.
"The skull was in good condition, although fragile, and was able to give us detailed information, " said bioarchaeologist Jo Appleby, who led the exhumation of the remains last year.
The investigation into his death follows another high-profile exhumation.
CNN: Chile set to exhume body of Nobel laureate Pablo Neruda
Mr Balkwell's father called the exhumation a "necessary evil".
BBC: Exhumation of Lee Balkwell in concrete mixer death probe
"The skull was in good condition, although fragile, and was able to give us detailed information, " said Jo Appleby, a lecturer in human bioarchaeology at the university who led the exhumation of the remains last year.
More often than not - as was the case in Peru's biggest mass grave exhumation and human remains restitution in Putis, Ayacucho - they themselves remember knitting the jumper or turning up the trousers worn by the victim.
He said the reason Leicester had been chosen as the burial site was because of the terms of the exhumation, which, depending on the identity of the remains, specified the bones must be buried in the "nearest consecrated site".
But the exhumation licence granted at the start of the University of Leicester's excavation stated that, depending on the identity of any remains found, they should be reinterred either in the nearest consecrated ground or at a suitable site of the university's choice.
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