Access is easy in an objective sense, 45/45 is probably about BBB level (although officially it's AAA equivalent). However the learning curve is steep and can make it difficult for some.
I know people who have done Access for CompSci after many years away -- and they simply did Access at the same time as a 1-year maths A-Level. I guess it is easier to learn maths in a quick period of time than it is learning essay writing skills and all that soft stuff. But not all CompSci courses are that picky -- you can get into some with Access alone.