The Coroner has ruled that the Hillsborough inquest will not be delayed because of the Independent Police Complaints Commission investigation and will start in early 2014.
Lord Justice Goldring will hand down a decision on the venue for the Hillsborough inquests next week.
The Independent Police Complaints Commission has interviewed five retired West Midlands officers, got documents from the Thatcher archive and expects 100 staff on its team in relation to the Hillsborough investigation.
They said a small number of organisations and individuals are resisting handing over information to the investigation.
The investigation is moving to the criminal and misconduct phase and they are working through a list of 1444 South Yorkshire officers and 400 others connected to Hillsborough.
Dozens of family members of those that died in the Hillsborough disaster will travel to London today for an initial pre-inquest hearing, the proceedings will also be streamed on a live link-up from Liverpool Crown Court.
The hearing was arranged to establish the process under which High Court judge Lord Justice Goldring, appointed to oversee the inquests by attorney general Dominic Grieve, would proceed.
Lord Justice Goldring also sat on the trial of 10-year-old Damilola Taylor's killers.
The pre-inquest hearing will be held at the Principal Registry of the Family Division of the High Court from 11.30am, and is expected to conclude by 4.30pm.
A hearing will take place today to discuss preparations for a fresh inquest into the deaths of 96 people in the Hillsborough disaster.
Families of those who died will find out how the inquests will work and what evidence can be used, they will also hear where the inquests will take place.
Last month a spokesperson for the inquest said that although today's pre-hearing will take place in London, it is no indication that the full inquest will be held in the capital.
Lord Justice Goldring was appointed coroner for the new inquests after the original inquest verdicts were quashed by the High Court in December.