My flight has been changed and now instead of arriving at 7pm we are arriving at 10pm - do I need to advise you of this? If so, what is the email contact that I can advise?

Once u have a reservation they will send u an email to confirm , if ur your flight is cancelled for a later day or date you can reach them by email or by phone

It's only a few hours difference, I think you should be fine. I don't have an email for them. If you want to be sure, on the email confirmation there's got to be a phone # or you could Google it and let them know. 😉