Hey I did what you are doing. I put all UK addresses on the forms, mailing and current. At the time I wasnt sure I was supposed to be in Canada doing outland. Afterwards I found out its perfectly fine. When you get the PPR it asks for a mailing address, so then I used my current address in Canada.
I got the PPR via email, then posted my passport to London from Canada using Fedex.
It is no extra cost to have it returned here either. They use recorded mail, although mine did take almost 6 weeks to be returned to me.
When you get the PPR it gives you all the info you need in regards to posting. They do post outside of the UK, as other countries use the London office aswell. I had no issues whatsoever.
Good luck with the whole process
