I'd just add by all means aim for the FPP if that is what you really want but be aware there are no guarantees that BA will run selection for the FPP every year, or that FPP will continue indefinitely. Recruitment schemes ( cadets/FPP/Direct entry, etc) come and go as the market changes and airlines change their plans.
In short just in case have at least some idea of a plan B, C, D, etc etc for getting into the industry.
Above all Good Luck.