Having recently moved from a full-service airline to work for a low-cost airline, I am aware that there needs to be a real culture change for all people involved. You don't just become low-cost by removing the catering and lowering ticket prices to fill the planes.
The entire philosophy of existing bmi staff involved in this venture will have to change. Working practices, culture, in order to achieve quick turnrounds, etc. That is not going to happen overnight, and if they are transferring significant numbers from bmi it will take a long time to get this approach up and running properly.