I did work experience at a law firm too! in that case economics doesn't even relate to law at A level (didnt even help with my personal statement), Politics relates to it the most. I'm going to do law at uni this September and if you want to do law it doesn't matter what subjects you do but Eng Lit, Geog, RS and Politics is a combo i wish i did, it'll open so many damn doors to doing law. Don't drop Eng lit, its an academic subject, if you want to apply to top unis you'll need two(which you got with geog).
if you want to do law you MUST get As. so with econ there's a chance you might have a lot of workload, its risky imo. Stick with politics.
P.s DONT do A level Law its a joke