The classic outline that the CAA set out for academic qualifications is 5 GCSE's including English Language, Maths and a Science subject. However this does not mean that these are pre-requisites to the course. All the CAA are doing is recommending that the candidate have sufficient knowledge of these subjects to start the course. In fact many schools will ask you to work through a induction pack before the course starts.
If you have higher engineering qualifications then I would think that this wouls prove that your are not stupid and are perfectly able to do the course.
Some schools may put barriers up but if you prove to them that you are up to it then I'm sure there won't be a problem.