Would a politics and economics courses be very statistic and number heavy? Would it also require me to be very good at maths? I’m thinking about doing it as an undergraduate degree but I’m not sure.
Depends - look at the content of the core modules. If you're seeing things like econometrics and theoretical micro/macro, you're going to be using statistics and calculus at the least. But how 'heavy' they are really depends on the uni.