Here it is.
High Commission of Canada
Visa Section
38 Grovsenor Street
London
W1K 4AA
United Kingdom
Remember to include identifying information such as your UCI, file number, sponsor's name, applicant's name, etc.
Edit:
Seeing as you are applying outland, would you like to add your details to a spreadsheet that I help maintain? It is a great tool for finding out averages of processing time, and the more data it has the better.
If you would like to be added please provide the following:
-Date application received in Mississauga
-Whether you applied as Married or Common-Law
-Date of sponsor approval
-Which office is processing Phase 2 of your application (will say on your sponsor approval letter/email)
-Date the permanent residence status changed to In Process on ECAS
-Date(s) of any other requests you've had
-Whether or not the principal applicant is non-visa exempt
-Current location of the principal applicant- closest major city is fine if you don't want to be too specific!
-Date of medical exam
Thanks,
Andrew