Thanks for the response. We are coming from the UK so only need to send a photocopy of the passport but won't we struggle to get the necessary paperwork to enter Canada if they post it to our old address? Surely this is done by courier and therfore the package can only be accepted by the person it's addressed to? I don't want IRCC to think we've been dishonest when I've been trying to tell them we've moved for months.Don't worry about it, weeks updating addresses is lowest priority for ircc.