Ask HN: required maths content in a Computer Science degree

I'm a self-taught UK-based web dev finally going to university in order to round out my knowledge with a degree in CompSci, trying to decide between London and Birmingham. In my research I've noticed that the best unis in London - Imperial College, UCL, Queen Mary, King's College - all require at least an A-Level in Maths (final years of high school in the US). By contrast, the more mid-tier unis - Greenwich, Brunel, East London - only require a passing grade in GCSE maths (early years of high school in the US).

As someone primarily going to uni in order to learn the CS theory that I'm hoping will both make me a better programmer and give me a good enough understanding of AI/ML to apply it to my business ideas, this leaves me wondering what the reason for this requirement might be and which type of course is right for me.

Are the top unis teaching more maths than I need - maybe to prepare students for a career in advanced computer science research - or are the mid-tier unis not teaching enough theory/maths for a reasonable understanding of computer science?