This rule seems to have changed:
Rules published 13DEC07:
A. Travel must be on the services of BA/CX/EG/JC/JL/JO/KA/NU/QF and their affiliates only.
F. Travel on any BA/CX/EG/JC/JL/JO/KA/NU/QF codeshare service operated by BA/CX/EG/JC/JL/JO/KA/NU/QF. Other codeshare services not permitted.