Lovely car, but you’ll have paid £16500 after the first 4 years (I’ve assumed £400/year for servicing, but in reality it’ll need more spending on it, it’s a BMW).
Then, when it’s almost 7 years old, you’re going to spend another £12k on it, making your total outlay in the region of £29k, with some big bills to come in the future.
I think the Motability model makes more sense for the majority of us.