[jimworcs]

Sadly, you have no recourse. The airline limits it's liability to refund of the money paid, in the event of a reschuduling or cancellation of the flight, regardless of your extra costs. The airline had refunded your money. What can happen in these situations is that the airline sends a mass email to everyone affected on that particular flight, and some of the more sensitive email filters pick them us as Spam. if you don't remember to check your Spam folder, the email can sit there unnoticed. The EU rules relating to a denied boarding or last minute cancellation do not apply to schedule changes.

As you had already been refunded, there is really very little that you can do. BMI Baby are usually a bit more responsive than Ryanair, but when it comes to this kind of a problem, LoCo's are all the same. If they don't sell enough seats on a route, they will ruthlessly cut the route... it is part and parcel of what makes them low cost.