Iain
I have an an average for my ATPL's in the 90's studying with GCNS. Entry requirements are the usual, ie PPL, Class 1 Med (I think), "Proficiency in Maths and Physics", English language, 18 years. Although no formal qualifications are required you are supposed to demonstate a proficiency in maths and physics to get accepted although this demonstration is not tested for as, as it is a further education college, free maths tuition is available for students to brush up weak areas.
Students in the class range from no formal qualifications, to school certificates, to graduates and to even doctors.