I think your biggest problem might arise with selection to any of the integrated courses at the approved schools. Although they are happy to take your money so you can get around this.
The selections tend to have apptitude tests which as pointed out will prove that you have the capacity to learn and that you're more intelligent than any piece of paper might suggest.
ATPL studies I think require a certain ability to learn, particularly maths and Physics although a base knowledge wouldn't be required as most of the physics is explained with an orientation to what you need to know to be a pilot. It's all close to GCSE level (as they were when I took them in the early 90's)