If your current car is running good, and meeting your transportation needs, keep it.
If you're married with three kids and a dog, and just can't fit everyone into a Focus, you should probably get a minivan or SUV.
If you've moved out in the country and have to drive over unimproved dirt roads, get a Jeep.
If you have a job as a landscaper and have to haul 1000 pounds of dirt every day, get a pickup.
If you've just won $400 million in the lottery, get a Rolls Royce.
And just out of curiosity, how do you own a sixth form student? I thought the British Empire outlawed slavery in 1833.