The only time I've ever seen an Airline moving crew around by flight is when there is already a flight happening and just diverting it to drop them off.I know that operationally this has to happen from time to time, but an airline that mainly pushes its green credentials, flying a flight from London to Cardiff to move crew is shocking
Imagine the flight got cancelled and all the passengers had to drive home and back again the next day in their cars because of the cancellation. That's not green either.