More than 500 people have told police they were victims of abuse by the late DJ and television presenter Jimmy Savile.
More than 200 allegations of sexual assault have been recorded by officers from Operation Yewtree, according to police.
"We are extremely grateful to those victims who have contacted us and commend their bravery. Without them we would have no investigation," a police spokesman said.
Allegations of sex crimes against children by Savile emerged after he died in October last year, aged 84.
A report is now being compiled by the Metropolitan Police which aims to "provide as clear a picture as possible" of Savile's offending, the spokesman added.
"The report is based on information provided from scores of victims who have come forward since early October.
"Details and data are still being assessed and finalised."
Officers are looking at three strands within their inquiry: claims against Savile, those against Savile and others, and those against others. This report will cover the first of those strands.
Seven people, including celebrity publicist Max Clifford, have been questioned in connection with Operation Yewtree, which involves a team of 30 officers and has already cost around £2m.
Mr Clifford protested his innocence after being questioned by detectives last Thursday, saying the allegations were "damaging and untrue".
Others arrested include Gary Glitter, comedian Freddie Starr and DJ Dave Lee Travis.