Thanks for responding. To clarify are you saying you can't change the country of origin? I have to keep it as UK? That's my question rather than being able to add segments (I did a OWE beofr they reinstated the award change fees).
This extract from the rules suggests that it should be possible to change the country of origin, particularly clause 14.7.4 (my bolding):
14.7 Classic Flight Rewards (excluding Classic Flight Rewards forming part of Combined Classic Flight Reward Bookings) - changes to tickets
14.7.1 Except as otherwise stated in this clause 14.7 and clause 14.8, changes are not permitted to any Classic Flight Reward at any time. Any permitted changes are subject to Classic Flight Reward availability.
14.7.2 If a booking is made that includes non-Classic Flight Reward flight(s) and Classic Flight Reward flight(s), then any changes to any Classic Flight Reward flight Segment or Segments in the combined booking may only be made in accordance with the conditions outlined in clause 14.8, and this clause 14.7 will not apply.
14.7.3 Prior to ticketing, Classic Flight Rewards may be changed without incurring a Change Fee; however, any changes will be subject to this clause 14.7 and to the advance purchase and validity provisions set out in clauses 14.2.2 and 14.6.1.
14.7.4 Subject to this clause 14.7, the following changes are permitted to a Classic Flight Reward after ticketing and
prior to commencement of any travel and will incur a Change Fee (see the
Fee Schedule) per passenger:
(a) change to flight number;
(b) change to date of travel;
(c) change to class of travel;
(d)
change to any Segment routing or airline;
(e) change to name (only for Flights with a Qantas (QF) flight number on the ticket that are operated by Qantas); and
(f) request to cancel ticket and re-credit Qantas Points. Please note that only Qantas Points that would not have expired will be re-credited.