Apologies - I wasn't entirely clear.
When I book a VIP ticket with FlyBe (equivalent to AF Premium Economy) I receive a snack voucher to claim on board the flight.
If I book Air France Premium Economy, I don't get this and have to pay for my food, even if it's a FlyBe flight.
I agree, it's such a small thing but when I'm travelling quickly between places I know that I will get an on board snack with FlyBe.
It is also very hit and miss whether you can check in online to a FlyBe flight if booked through AF which means I have to get to the airport earlier that I would had I of booked direct through FlyBe.
But ... to get my AF level points I need to book as much through them as possible.