Can i go back to the philippines? would there be a problem?

hi, since the canadian embassy is only requiring a photocopy of my passport, can i go back to the philippines while im waiting for my live in care giver work visa be granted. Im planning to lodge all the needed documents in the canadian embassy in london, but the problem is, my UK visa will be expiring so soon is it possible for me to go back home to phils and wait the result there? pls answer.