Thank you Duncan & Jim.
I have loaded the app into my smart phone.
So if my thoughts are correct, would the following happen?
Travelling for 10 days in June
7 days (or less) prior to the outward journey, I would check in on the app. The app would then be all that I need at the airport.
3 days later, (7 days or less till the return leg of journey) I would then check in again on the app and once again produce this at the airport. I take it Murcia airport accept app boarding cards?
Also, as there will be two of us travelling, would we both need to do this. Or, as it is one booking, would both app boarding cards be on my app and that would be all that is needed?
Many thanks for your help.