I've taken studies to Research Ethics Committees and this is how it works:
You write up / collate all the study documents. This will include at least the following:
Protocol
Participant information sheets (part of which is the consent form) - for this study there will need to be separate forms for parental consent & a child participant information sheet
Drug characteristics summary
Copies of all questionnaires used in the study
Letters from study sponsor (KCL), funder etc.
Using an online programme called IRAS you input required info about the study. That's everything from what the point of it is to your data management plans, lists of staff, locations - takes days to do. You select which REC you are applying to - someone has to attend in person (not sure if they are using Teams these days) but they get booked up in advance so it's a balance of choosing one you can attend but don't have to wait too long for.
Sponsor representative and study CI have to sign off the IRAS submission. Documents sent in electronically. REC reviews all documents, can request more info before the meeting
REC meets and discusses study - calls in study representative (would be Chief Investigator here I'd expect) and asks them questions.
No answer on the day. CI will receive REC outcome a little while after - often have to make changes and resubmit. I've only ever had to make minor changes and send in updated documents for approval, never had to attend a 2nd meeting. They could flatly refuse approval.
I've never been a REC member so I don't know what their record keeping is like. You'd hope their discussions were minuted but I've only ever seen the outcome letter.