We were able to change the ones we had booked for 25th May til the end of September without charge, despite being a £390 odds of a difference as the dates we chose for Septemebr falls on a bank holiday. Whether we get is a different story. Also got booked this morning for 2 weeks next May -Gla-Dlm, including seats, for £198 in total. Still to add bags, which we do nearer the time.