Domestic connection - not possible to UUA online but possible over the phone
Just booked DOH-LHR-NCL-LHR-DOH with UUA to CW on NCL-LHR-DOH.
Interestingly, although it was possible to book LHR-DOH using UUA online it was not possible to book NCL-LHR-DOH using UUA online.
Yet it was possible to book NCL-LHR-DOH using UUA on the phone.
Now of course NCL-LHR books into J on a UUA so no problems booking over the phone.
But this sounds like a BA.com bug.
So I will raise the flag and announce with sounding brass and clanging cymbal: "BA.com, you have a bug!"