Only you can answer that one. If you got a great deal and like the car, then no way be gutted. Enjoy the car.
If you didn't get a great deal, weep at the lower CO2 emissions with the new version, cry at the new facelift cos you love it, and dream about the dame edna lights every night then clearly, you should be gutted.
Treat yourself to a beer and try not to weep into it, if you fall into the latter category..