This may be applicable, ignore it if not.
I'm off to University of Kent next month. IIRC, entry requirements for my course were AAB at A-Level, but only a Pass from Access candidates (only specific requirements were that I had to have relevant subject credits - no particular grades specified). I see that as a clear disparity in favour of mature candidates. I exceeded the minimum requirements, though, so I can't be sure that I'd have still been offered a place had I only met them.
FWIW, of the three unis I visited when trying to make initial UCAS application and final Firm choices, Kent were the most receptive to me as a mature candidate.