A senior Home Office civil servant faces a grilling by MPs over its handling of child abuse allegations made over a 20-year period.
Permanent secretary Mark Sedwill will appear before the Home Affairs Select Committee to face questions over the quality of a review he commissioned last year.
As Theresa May announced new inquiries to Parliament yesterday, the Home Secretary said she was confident that the work commissioned by Mr Sedwill was "carried out in good faith".
However, she added that with "allegations as serious as these the public need to have complete confidence in the integrity of the investigation's findings".
The Baroness says she did not consider the "difficulties" caused by her background and family connections to the child sex abuse inquiry.
Questions have been raised of former High Court judge Baroness Butler-Sloss since her appointment last week.
22 police officers are now assigned to Operation Fernbridge - the probe into claims of a Westminster cover-up of sex child abuse.