Booked my QF SYD-MEL-SYD J flights x 2 for 18,000 Avios and £21 each over the 'phone.
The staff member was able to allocate seats in row 2 - row 1 was blocked - probably for QF Elites. Used the booking reference to update the booking on qantas.com as it is not possible to request seats on ba.com.
Noted that my email address was wrong so worth checking the booking on the QF site.