MPL is a bit of an issue because its linked to a company type and also SOP's
After a period of hours on type 1250 I have seen banded about it because unrestricted and transferable.
Before that your a bit stuffed and may have to convert onto the normal system if everything goes tits up. This would mean that you would have to do any additional training that's required to qualify for a normal CPL/ME/IR.
To get the full differences you will have to look at CAP 804. You would have to make up to the required experience levels.
but is there ever such a thing as a job guarantee in todays industry?
BA followed by Monarch in the UK are about your best bets. But bet is the right term because its is a gamble even though the odds are pretty good.
There are other things which can screw you up. Medical being one of them.