My eldest, who has Asperger's, realised last night he'd made two course errors on his UCAS form which was submitted yesterday - applying for Master's not UG courses. The code was a tiny bit different in both cases. The other three choices were at least UG courses and correct!
On the phone this afternoon the Admissions Officer for one of the two remembered processing the application, checked and was able to sort the offer there and then! One of the other universities did so as well for a UG course.
He's now sitting on two Unconditional (if firm choice) offers despite not having finished his A-levels yet and is very, very relieved.