I hope it all goes well for you (and me in admissions) tomorrow.
In case it helps, this are the rules which we are working to for admissions this week at my uni. The offers were related to particular courses
All students who missed AAA but achieved AAB have been accepted (we don't make A* offers).
Some students who missed their AAB offer but have ABB have been admitted where we have quota spaces (they are ranked on overall UCAS points so things like general studies or AS not taken to A2 come into play.
Some students who held an offer of ABB or less but achieved missed it by one grade have been admitted. Again only when there are quota spaces and their overall UCAS points is level or above the original offer.
We will not reverse any decision already made unless a grade change occurs from a remark.
In clearing, students above AAB will be admitted on most programmes (spaces vary depending on the course).
For students below this level, the website will state the entry level required. In the first few days we cannot admit anyone below the stated level. If places are still available next week. On popular courses, this usually only happens when a student who held a place withdraws.
BTW the reason UCAS points are important at this stage is that it is the average point level (rather than the grades) that are used to compile league tables. Entry grades are a more important score than value added (how much students improve). Getting a higher league table position on who you recruit rather than how well you teach is really stupid IMO, and unlike schools the difference in the data is not easily seen.