A-Levels for Compsci? Watch
For Imperial, u definetly need a science or further maths, to do computing, and for York, u need either physics or electronics to do their course!!
Good luck with whatever u take
Well I'll make up my mind in the next couple days, after I get to talk with the british council people...
and good luck!
Fundemental computer science is physics anyway! You should do mathematics and physics imo.
If you must insist on comparisons then I'd suggest that compsci is a mix of engineering and mathematics.