I do not like to be worrying about something comparatilvely trivial when there are so many people stuck away from home. I do have a question and if it has been answered elsewhere I do apologise

We were going to VCE on using a companion voucher. Due to medical issues my husband could not travel. I called BA and they put the cancelled the trip (I paid no fee as I am Gold) but left the PNR the same. We have to make the journey before October. I am now trying to travel on particular dates in June. I can see the on the outbound date there is no availability. The return is fine. However there is availability however to BLQ. Do you think that I would be allowed to change the booking from LHR-VCE-LHR to LHR-BLQ-VCE? It is not the end of the world if we cannot - it is merely more convenient. If not I will wait to see if any availability comes due on the date (18th June to VCE, and if not I will book the next day when there is. I hope that all that makes sense.

I would value your advice please.