if you extend for the 2 years at the end of your initial 3 years and you find something that floats your boat then you can change. you only get the higher gcb though if youve completed a full year.
so if your coming to the end of your 3 year lease and you cant see anything you want to change to, you ask to extend for the 2 years. then if 18 months later something comes on to the scheme or an ap drops into your budget or a dealer has a fantastic offer you want to take advantage of you just ring up and let them know and they will put it on the system so you can go and order. then the procedure is just the same as a normal end of lease. if youve done a full 4 years you get the higher gcb.