Because those offences are historical offences—as I said, buggery and gross indecency have not been part of the Criminal Code in over 30 years—it may be difficult for individuals to obtain court or police records. In some cases, it may not be, but if that is the case, as part of their application they would have to demonstrate that they did try to obtain those records and provide an affidavit or a solemn declaration that those records don't exist. Also, the act provides authority for the Parole Board to conduct their own verifications as required.
On December 11th, 2017. See this statement in context.