Originally Posted by
GlasgowBlue
After some rummaging around the web it seems that there’s no BA codeshares attached to the flights so I wandered if that was the reason for not being able to book as standalone flights on BA.com
This is incorrect. For example, on the 28th QF409 is also available as a BA codeshare (BA7437). You won't be able to book it as a standalone flight though for the reasons other people have already mentioned in this thread.
If you were buying a RTW ticket, you might or might not be able to book the BA codeshare depending on the rest of your itinerary and the traffic restrictions in place for the codeshare (which unfortunately I have no way of checking without access to a GDS).