I received following email from London Office.
Dear Applicant,
Thank you for your email of October 4, 2012. As your medical results were to expire on October 10, 2012, we had sent a request to our medical section to reassess medical results for yourself and your family in order to enhance the validity of your medical results. We have now received a response from the medical section who advise that a repeat chest x-ray is required for all except Khadija who's medical will now expire on 26-09-2013.
Please note that the letters requesting you to undergo repeat chest x-ray will be sent to you by our medical section very soon. The results for the background checks have been received which are satisfactory, this means that we will be ready to issue your permanent residence visas as soon as your new medical results have been assessed and updated in our system.
We apologies for any inconvenience.
Yours sincerely,
RIH
Program Assistant
Immigration Section/Service d'immigration
High Commission of Canada/Haut-commisariat du Canada
MacDonald House
38 Grosvenor Street
London W1K 4AA/Londres W1K 4AA
United Kingdom/Royaume-Uni
Government of Canada/Gouvernement du Canada