A440M needs more money

The RAF has 25 Airbus A400Ms on order but they are going to have to wait a long time for them, so long in fact the aircraft they are to replace (older Hercules) are going to wear out and need to leave service long before A400M will be available (it hasn't even had a first flight yet). Now Airbus are saying customers need to provide more money. That may be a tough sell considering the already tight status of the defence budget and the fact money needs to be found to bridge the gap. Cancelling A400M is an option.