Copy and pasted from the UKBA website-
When you save or submit your online application form, we will send a confirmation email to the email address that you supplied in your application security details. This email will contain a unique reference number (known as a GWF).
You should make a note of your GWF. You will need it to log in and access your saved form. We will not be able to assist you if you do not know your GWF.
If you do not receive your confirmation email, please check that:
- you have given us your correct email address, and
- the message is not in the spam or junk folders in your mailbox.