Applying to Oxford with a BTEC Diploma

I applied to Oxford for their PPL course, but on Monday (only a few hours before the deadline) my college told me I could either continue the 1 A-Level I take alongside my BTEC, but I would only recieve the equivalent to BBBE precticted grades. Alternatively, I could drop my A-Level and recieve A*A*A* equivalent predicted grades.

Of course, A*A*A* is much higher than BBBE, so I chose to drop the A-Level, but does this guarantee that Oxford will reject my application now that I'm only doing a BTEC Diploma?