No A-levels = no future in City law?

If I don’t have any A-levels are my plans to become a City lawyer scuppered?

I recently met a graduate recruitment officer for a city law firm. I asked all the usual questions, but one thing that struck me as being interesting was when I was told that a candidate without A-levels was more than likely to not be invited for an interview. I attend a former polytechnic university where the majority of students do not have A-levels and are therefore at a major disadvantage. Does this mean that community educational providers should only take on students who have A-levels or should law firms change their approach to measuring a candidates suitability?