Other than a top 1/2 dozen or so most will make you offers if your predicted grades match the entry requirements and often will make you an offer if just below.
Rankings are meaningless and Maths courses are often very different. Some might have a mechanics base and others specialise in Stats.
Do not go just on rankings or reputations as they are meaningless and ont tell you whether you will enjoy the course.
Look into the course. Is it right for you. Would you feel comfortable living there. These are the key issues.
Maths courses offering below AAA include Swansea, Aberystwyth, Cardiff, Reading, Sussex, East Anglia, Liverpool and many others.