Hi there, I applied for the Canadian visitor visa online and I should send my passport to Canadian High Commission in London for visa stamping. I will enclose a UK special delivery envelope for returning my passport. I am just wondering if I can let them return my passport to my friend's address by just writing my friend's name and address on this special delivery envelope. (Because his address is much more reliable than mine for receiving posts) Do I need to write an authorisation letter? Does the official website say anything about this, I didn't find any... Many thanks.