Don't have everything you need...
You don't have to complete your application all at once. You can save the form and come back later, but ideally, we would like you to complete your application within 5 days of starting it.
When you log back in you will pick it up again at the point you last saved, you can login and complete bits as many times as you like until finished and submitted.
Just hit the 'Save and come back later' button on any page.
Have a different question? We have over 100 answers for you: here