Ravs,
Consider what you are likely to do at the 3 year point with this current car.
I appreciate Huckster's notions but if you are just going to change your car at that point, taking out another similar finance package, then it doesn't really matter when you change the car.
Unless you intend to pay off the full balance on the current car and keep it, change date becomes irrelevant. If you are always going to be paying £200 a month for your car then I can confirm, at first hand, that the New Fiesta is a million miles better and certainly worth £7 per week more than the previous generation.
JJ
You gotta tie yourself to the mast my friend, and the storm will end.