Would oxbridge/UCL/LSE accept me?

I got 7A*s at GCSE in maths, physics, chemistry, biology, history, philosophy and ethics and economics. 2A's in both english Lang and Lit and finally 1C in Spanish. My state school average was about 3A's 4B's 2C's compared to my 7A*s 2A's 1C (I took an additional GCSE economics and further maths which isn't a GCSE but I have a further maths qualification which prepares you for A level. Please reply saying honestly if you think I have a possibility of getting in with those GCSE grades (I want a degree in economics)

Your GCSEs are obviously very good, but in reality, they will form only a small part of your application. For really competitive courses- such as economics at LSE, the vast majority of applicants will have excellent GCSEs- you will also need to do well at A-level, produce an excellent personal statement, and have a good reference. At Oxford or Cambridge, you would also have to interview well.

If the average student at your school achieves 9 A*-C grades, it's very unlikely you would receive a contextual offer from any university unless there are other circumstances involved.

No-one can really comment on your chances of getting into a specific university based just on your GCSEs.