Originally Posted by golfmad

I'm not sure what dates you're looking at but at the moment BA is not selling F to HYD. It's possible that you've picked a date that says it's going to be operated by a 789 which is fitted with an F cabin but it will remain unused unless it's needed to accommodate additional passengers. If that happens, the F cabin will be used but a Club service will be provided.

You can read more details about what that looks like here:

https://www.flyertalk.com/forum/brit...-aircraft.html