8 Dec '17 - IP2
Call them on this number "+1 (613) 944-4000",they will tell you where your file is getting processed,In my case I had an update of NADR last week of December,and from the forums I figured out this change happens when file is transferred to London,same was confirmed by the agent when I called them,I had submitted the Letter of Explanation too.Sorry, I don't understand what "central office" means.
I got a response to my enquiry to CPC-CTD-Ottawa@cic.gc.ca stating that "your application is currently being processed at the visa office in London".
P.S : Use gmail (Hangouts)to call them,that way you can browse the internet while you wait for your turn,and in case they hangup because of too many calls on hold,its free.
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