Sorry about that Tsunami quotes wrong post haha,
Mate apply for Accounting and Finance at LSE, A level Maths is recommended but not required, you will however have to drop your options module in 1st year and take an extra maths course but A&F at LSE puts you in top stead for IB.
Thats what I did this year, I don't have A level or IB HL maths but managed to get an offer. Its not impossible as long as your PS and predicted grades are great. You have to let your passion come through in your PS, which you obviously have.