Received reply from London VO
Dear Applicant,
Thank you for contacting Immigration, Refugees and Citizenship Canada (IRCC). This is in response to your recent enquiry.
Please note that the London office currently has a high volume of documents for printing and therefore print times are longer than the average time expected for visa offices worldwide, which is 4 weeks.
While we are unable to provide a processing timeline in light of the above, we assure you we are working to send you your documents as soon as is possible in the circumstances.
We trust that this information will be of assistance and thank you for your patience and understanding at this time.
Best regards,
London, UK