I have a very similar problem.
I'm really enjoying my Economics A level and really want to take it further. I'm thinking about going into commercial law as a solicitor. I'm not sure, however, if I can handle the level of Maths required for a full Economics degree - currently I only have a GCSE A grade in Maths.
So I've been looking into Law with Economics - combined courses. With the exception of SOAS and QMC, no really good Unis do it. This is a little surprising, as one would have thought this was a really powerful combo (?).
So I'm stumped, really.