Thanks all for the helpful advice and hope.
I think we will chance it.
Correct me if I am wrong but since it is a connecting flight SNN-LHR-YVR do you think once we get past SNN and arrive in LHR we don't need to check in again do we? We are just shuttled to the terminal?
It's been about 5 years since I have done a connection so correct me if I am off base.