When Do I Need to Fill Out P85? No Overseas Address Yet

The gov.uk website seems to be telling me that I need to fill out a P85 form prior to leaving the UK to live and work abroad. However, early on in the online form it asks me for my overseas address. My new employer is putting me up in accommodation for four weeks when I arrive - but I assume I can't use this address as it is not 'my' address? The form also suggests they will/may contact me at this address, so I can't really use this address on the form. Can I fill in the form after I leave the UK and have my own address? I will have been out of the UK for over a month by this point. I've been running into this problem a lot, with Student Finance etc, where I'm supposed to fill in forms with addresses/payslips etc that I do not have yet and it's very frustrating.

Hi Emily,
Yes, you can wait until you have your new address and then submit the P85. 
Thank you.