Those are still pretty good grades and I'm sure with a remark and perhaps a resit for maths you can bump it to an A. Luckily maths is probably the easiest subject to resit as the units are smaller and AS is essentially a basic version of A2. Whereas history, for example, the AS units are completely different content. I would say you can still aim for Russel Group standard unis, ie York, Exeter, etc. However the top russel groups, such as UCL, Durham, Oxbridge may be out of your reach.