Well, not really, but I know what you meant. Discovery comes after the charge vice the election. Member is marched in, RDP'd (charged) and then receives the file and is sent away to consult as appropriate for min 24hrs. At some point after the initial 24 hours has passed, mbr will be brought in again to make their election as to TYPE of proceeding.
Vern is bang on. Full; disclosure is made at the time charges are laid (i.e. the accused is given his RDP) or very shortly thereafter in order to allow him to make an informed decision about ST or CM. The 24 hours is a minimum and the accused can reasonalbly request more time. In the Class A Reserve world, "24" hours" usually means about a week.
One key difference to remember between ST and CM is that at an ST you will be asked if you "admit to the particulars" and not to plead guilty/not guilty. What you are, in fact doing is admitting that the statement of offence as written on the RDP is factually correct. At that point, the presiding officer can find you guilty/not guilty - without another word being said - but likely based your admission, coupled with the evidence presented for/against you (witness statements, your statement, AO's submission etc.).