Speech-to-text reporting is suitable for people who are comfortable reading English, often at high speed and sometimes for up to a couple of hours at a time. At large events, information can be projected onto a big screen or several smaller screens around the room.
You will normally only need one STTR, but if the event is longer than a few hours, mention this when you make a booking. STTRs should have regular breaks. Remember that there must be a table and access to an electrical socket for the speech-to-text reporting equipment.
STTRs are regulated by the National Registers of Communication Professionals working with Deaf and Deafblind People (NRCPD). Registered STTRs must respect confidentiality and stay completely impartial.