When you submit your UCAS application for your chosen course at university it will be read by an admissions tutor.
THE ADMISSIONS TUTOR:

Is a lecturer in the subject
Has been promoted to the position of choosing students for their degree course
Recruits the target number of students to ensure the course is financially viable (jobs can be lost if the target is not reached or even exceeded)
Is a gatekeeper between you and your chosen course who can let you pass by giving you an offer (e.g. AAA, CCC, EEE)
Can close the gate by declining to give you an offer
Often starts providing offers as soon as applications are received
SO GET GOING! LET YOUR ADMISSIONS TUTOR RECEIVE YOUR APPLICATION EARLY IN THE PROCESS