Check with the college you'd like to enrol if; if you have no level 3 course currently you should be entitled to the fees covered (and I know the government has started introducing loans for 19+ year olds...i'm 99.99% sure) but check with the college.
You can absolutely do a levels; don't have to do a foundation course, it's just generally advised as it's deemed ''more suitable'' for ''mature'' students.
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And yeah it will depend whether your college takes over 19 year olds, but I believe at least 2/3 in my ''local area'' accept people of all ages so it's not an impossibility.