11) Do I need to print the payment confirmation page if I've bought extras or upgrades?

TUI flights and for the following airlines: 
Air Europa, Albastar, ASL Airlines France, ASL Airlines Ireland, Evelop Airlines, Germania, Norwegian, Travel Service, Volotea

No, we'll send you an email confirmation to the email address you gave us on the My Booking page. It'll include details of what you've bought and the amount you've paid.