Thank you very much for your reply.
I was thinking that in my case I would not be able to show any proof of intent to move aside from letters from family in Canada saying i could stay with them.
But i do plan to move there first while my wife stays behind in London but all of these steps would happen after we mail out the application as funds are tight and the cost of the application is so expensive i will need to save up some money before i leave london. I just wasnt sure if i should update them on my application when i do buy the ticket to show proof or is to late once the app is mailed out. If not can i email them to udpate them or does proof need to be mailed only.