Where did you hear that? They couldn't log on to his laptop so they brought in an external company to do it - something they surely wouldn't have done if it had just been a drugs raid. The files were in an encrypted folder which was in another encrypted folder, which was in another secure folder. His ex girlfriend reported him to police (I can't remember the exact date, but 2008 rings a bell) but they never took it seriously.
Sky News I think. I know all about the encrypted shit...he had 27TB of data on external drives, cloud servers, all locked down. But yeah they found something dodgy on his laptop which made them go looking for the rest.
27tb is right. I've just not read anything about him being arrested for drugs, I was certain it was all about the sexual abuse.