My advice would be to do the subjects that you are best in. A CV with better grades will be more impresive - despite the subject choice.
Don't believe everything the old school say about Maths and Physics - I only did these at GCSE and the basic knowledge gained has been more than adequate through all my pilot training. The only maths you need is a reasonable level of mental arithmetic.
Groundschool teaches you what you need to know to fly safely, and hardly any of this will be covered in either of the A-levels you mention! Several of my friends did an Aeronautical Eng degree but even this was of little relevance for the job training; and they wish they'd done something a little less taxing in hindsight!
In my opinion it is far better to excel in the subjects that you enjoy and are good at, than struggle at A-levels (and Degree for that matter) in options that you perceive to be useful. Employers are looking for a broad spectrum of interests and education, giving a well rounded individual. Trust me, you don't have to have Maths and Physics A-level to be pilot!
For the record I did English, Geography and Biology at A level, and Philosophy at Degree!
Good luck with whatever you decide to do!
