Hi,
I have to admit that I had never heard of the IGCSE so have just done some Googling. As I understand it, they are the equivalent of GCSEs, rather than A Levels.
A foundation year is usually an introductory year, prior to an undergraduate degree, and is often taken by people who are moving into a different subject area, or occasionally those with low grades/low standard of English, for example.
So I am not sure why the college has accepted you onto a foundation year without any A levels, as I thought they (or an equivalent, such as Scottish Highers/Baccalaureate) were a requirement for any foundation year/undergrad course. (Is it because of your high grades/large number of subjects covered?)
However, that being said, if you have done IGCSEs, then you do a foundation year, then a degree, then possibly a Masters, then I can't see that any university would care that you didn't have any A levels. If a college have decided that your IGCSEs are enough to qualify you for a foundation year, then I can't see it being a problem in the future. The degree/masters are the most important things, so if you get through those without any A levels then that would be the most important thing.
Hopefully someone with some personal experience will be along soon to give more advice!