If you are trying to get your probation supervision suspended, I'm guessing you are a lifer. In that case, it is done by the Parole Board and the referral has to be made by your probation officer. It is covered by a Probation Instruction, PI 08/2015, which you can find here
. The bit that interests you starts at Section 2.6, and Section 2.11 says what your probation officer needs to do. As a probation officer, she must
have access to a copy, but you can always print it out and show her. As it's done by the Parole Board, you should be able to make representations.