From what it says on the CAA website VA of 6/7.5 is ok for class 2, even if his binocular vision is not better than the 6/7.5 corrected stated for each eye.
Visual System GM | Medical | Personal Licences and Training
(2) in the case of class 2 medical certificates, 6/12 (0,5) or better in each eye separately and visual acuity with both eyes shall be 6/9 (0,7) or better.