Pre uni helpWatch
Though the way clearing works is you ring the uni and they generally tell you over the phone if they will accept you or not. So if there is space, and they accept you, as long as you apply in good time then you should get in.
Oh. Person above beat me to it
The problem with asking to be released into Clearing is that your original firm offer is lost.
Loads of really information about Clearing and Adjustment here - http://www.thestudentroom.co.uk/cont...ing-adjustment