Few universities, even among the RG and similar, require more than a pass in GCSE Maths and English, if the course is not specifically numerate (or medicine). I wouldn't worry about it - if you didn't have the necessary passes it would be worth it but you've achieved that so on paper you're fine. You may find it useful to review some of the GCSE maths content, in particular statistics and graphs, if you want to pursue Psychology, as it will be helpful to have had a bit of a refresher for those areas.