Chances of offer - Economics at top unis

What are my chances of getting an offer for at least 2 (possibly more) of the following courses - Economics and Management at Oxford, Economics BSc at UCL, Economics/Finance at LSE (I'm currently undecided as to which to apply to) and Economics BSc at Warwick.

I ask as I would like to get into investment banking when older, so am only really interested into going to a 'target uni', however applying to these 4 competitive courses would leave me with only 1 'insurance' application.

For context I have 11A* and 1 A at GCSE, am doing further maths A-Level and expecting predictions of at least A*AAA for A2 (and possibly higher, up to A*A*A*A I think).

For my personal statement I have entered the RES essay competition, have done some wider reading, kept up to date with finance and economics news and am applying for finance work related experience this summer.