The big benefit rox is not paying an AP every 3 years, the additional 2 years also allows additional time to save for the AP. The £900 for five years can also go towards your AP making it far less of a burden.
If having a new car every 3 years is a priority then this won’t be any use to you but I would rather pay additional money for a high spec car with everything I want and keep it 5 years.
We are all different, that’s what makes life interesting lol.