If you are looking at a car which you thought looked new, and then found it to be 3 years old, surely that means cars are ageing more slowly?
I bought my last car in Feb 2005 (54 plate), and my latest car (same model) on March 1st, 2009 (09 plate).
The cars look identical except for trim changes, and alloy wheels now standard.
The value variations depending on plate are only a starting point; haggling over the "free" extras can sometimes make the plate irrelevant.
I went to my dealership in Nov 2008, and said I was changing for a similar model, and they gave me a figure.
I then haggled with them over the extras and, because I was ordering a 5-seater instead of a 7-seater, a special order had to be raised with the car makers; taking planned delivery to late Jan. 2009.
Towards the end of Jan 2009, I found a buyer for my current car, but he could not collect it before the beginning of March. I said I didn't want two cars around my neck, so the salesman ageed to arrange the delivery for March 1st, and on an 09 plate.
After agreeing the order for the car in Nov 2008, the VAT rate dropped. On final payment for the new vehicle, I managed to get the VAT dropped to 15%, saving me another £330.
The agreement for trade-in had been set on the basis of either bringing in the old car, or the trade-in figure.
And that figure had been set based on the Nov 2008 value.
With the extras I achieved, plus the manufacturer's discount, plus the reduced VAT, I reckoned up a "gain" of around £4,500. That, added to the trade-in offer, came to more than the retail value of the car in Parker's Guide by around £2,000