Well, this is going to be embarrassing for you:
"A level and IB applicants
who are not able to take the Mathematics AdmissionsTest (MAT) will need to sit a Sixth Term Examination Paper (STEP) with the requirement of a
grade 2 in either STEP II or III. In addition, candidates who have a borderline mark in their MAT paper may be considered for a STEP offer. For more details on STEP (Sixth Term Examination Paper), which is also administered by ATS, see: http://www.admissionstestingservice.org/our-services/subject-specific/step/about-step/"
http://www.imperial.ac.uk/natural-sciences/departments/mathematics/study/admissions/undergraduate/applications-and-offers/Perhaps you should get your facts straight before you criticise others.