Economics at a good university: but my subjects are all wrong!

I have recently decided I want to study economics at uni - preferably Cambridge/LSE etc.

I got 9A*s and 2As at GCSE.
My current subjects are:
Geography
Physics
Maths
Psychology
General Studies

I am predicted AAAAA at AS level.

But I have neither economics nor further maths. Even if I took economics and further maths next year would i still be disadvantaged as they wouldn't know of my previous performances?
Would you recommend taking both the AS and A2 of economics? And is AS further maths not enough?

Should i apply anyway or would i be wasting my time?

Thank you!

For Cambridge you would need Further Maths unfortunately, and economics is preferable.

LSE aren't so strict and only see F. Maths as a 4th subject.

But 90% of econ students applying at the top unis do have Economics, so be wary of that, you would need to show plenty of economic knowledge to be competitive.

Thank you!

Do you know whether cambridge want further maths A2?