I have offers for 2007 (deferred entry).
UCL L100 Economics : AAA
Edinburgh L100 Economics : BBB
I am accepting UCL as firm and Edinburgh as Insurance. If I get say AAB on results day and get rejected by UCL, can I withdraw my UCAS application (thus cancelling my offer from Edinburgh) and apply for various courses through UCAS next year (bearing in mind my current offers are deferred entry).
Yes, without a hitch whatsoever.
Yes but if you do get less than AAA I think they say you should phone up to see if they will still accept you