I would also ask the UcAS helpline.
Its not uncommon I think for people who are doing (some) foundation courses to apply/ get places in June /July once their foundation course has been passed.
Some of the unis have sections of the application policy on thier websites that give more info on this. Sheffield for one I seem to remember.
But that said, knowing that they do it is one thing, and knowing HOW they practically do it I have no clue.
Well done on passing your foundation year course and hope you manage to make sense of the administration side of things.