Thank you for your reply.
I don't think more math and no econ would be a gateway to a funded phd in econ, which is why I asked. I've applied to a number of degrees, some of which are maths, some of which are econ, and these are the ones that've responded by now. However, I have done work for an economist who's been in the phd admissions committee at NYU and Princeton, and he encouraged me to either do a masters in math or go to LSE.
I don't see how the 1-year and 2-year econ degrees are substantially different, since they constitute the same courses in the second year. The only exception being that it's near-impossible - from what I've heard - to get any recommendations in one year, since the program starts in October and I would be applying to phd programs within a couple of months.
If we assume that I'm below average in my cohort, then clearly I won't be accepted to any phd programs. But that goes for any of the mentioned programs at LSE, so I don't see how that's a relevant assumption to make?
Where do you see LSE's placement data? I can't find it and would like to see it, thanks!