We've had to cancel a trip to the 'far north west' next month. Calmac have said that rather than delaying bookings, get a refund and then re-book in the future. Their online 'refund' form was simple and should have the money back within 21 days. (We have delayed our various accommodation bookings for a year and all the owners have been very grateful that we still want to come.)
Not actually a 'package' I know, but...