Didn't know there was a HBO CE fare
Well, to be exact, that you could travel Club Europe but have no checked-in baggage allowance. My wife booked a HBO fare but was offered an upgrade for the return sector for 89 euros, which she accepted, thinking it that it would also be handy to check in her one piece of hand baggage as it was a bit heavy. However, the checked in luggage allowance remains at zero. BA wanted £65 to check in the case to which she said no thanks.
Annoyingly, she frequently finds that her cabin baggage is taken off her at the gate to be placed in the hold, presumably due to lack of space in the cabin.