QUOTE(cat_loves_flute @ Jun 1 2008, 12:19 PM)
Thanks - is all I need to call up to change the applicant number?
...I want to make sure I have everything I need to do it first thing tomorrow morning.
Things which may be helpful in addition to the applicant number are the applicant's name, your name, and the details of centre, date and time that you have already been allocated, as that appointment will have to be cancelled when a new one is made. If you have the direct-dial number from the exam notification to call that's fine, but if you are just calling the general number you will be asked which area you are in.
Good luck! I've also been very satisfied with the help I've had with changing appointments in recent years.