Originally Posted by
ENTP
Search for a regular First Class award seat on the flight in question.
If availability shows call BAEC to upgrade.
It's possible that availability may show up quite late on this route, once BA is satisfied that it's unlikely many more people will be wanting to book revenue First tickets.
Exactly... the upgrade option in MMB doesn't work 90% of the time. Search like you're looking to book a new trip (using avios) in first on the same dates. If availability shows up then call BAEC and they will upgrade you.