i sent it to the london office
why you ask?
my friend initial applications always need to send to cio,ns,canada not to visa office (chc london) directly.
they will return your application . they may charge or not the fees. if they charge you the fees they will refund. i think you didnot look at the website properly.
i know two more cases like you whose application were returned when they sent directly to visa office in error. after they return your application you can reapply again. but make sure your noc falls under 29 needed occupations and your job duties match with those under hrsdc website.
thanks