My apologies for the hostile response, it has been one of those days!
I cannot remember what other courses they had applied for but one was PPE and another was Economics. So do you believe it would be best at aiming for one course per Uni? Or because PPE and Economics are so different that it is ultimately too risky. As you said, just because there is a precedent, doesn't make it a good idea!
It was my sixth-form that previously informed me about the Oxbridge application, thank you for that though - it is a massive help!