This was a one way fly cruise, 10 nights Southampton to Barcelona. I booked a one way car hire to Southampton, cruise only with Cunard and booked hotel and then flights back to Cardiff. It all worked really well and I would happily do something similar if Cunard reintroduce fly cruises in the future. I booked an extra suitcase on the flight (approx £30) so there was no issue with luggage.
Embarkation/Disembarkation
Very easy on both occasions, we were a bit early for our 12.30 boarding time and were on board and eating lunch in the Golden Lion by then.