Originally Posted by
KARFA
The official policy is that avios bookings do not have free SDC, but you can move them on the day if the new flight has reward availability for a fee of £60.
As noted, you can ask and sometimes it does happen for free, reasons can be if it is a disruption day, or that you get a kind agent.
Yes indeed. I can also confirm this, having used both options in the past to move AMS flights when arriving unexpectedly early at LHR.