It turns out that I know the man that the dealer uses to do all his prep and servicing work. When I had the doors on my Focus replaced, this chap did them and I also bought my horrible 407 from him. It’s a small world.
We took the Jazz for a test drive today, very smooth, very clean and all seemed good. I was concerned that the i-shift transmission would be a bit iffy but it worked very well. My wife (who’s never driven an auto before) also had a drive and was perfectly happy with it. At the first set of lights I pulled up at, I thought the engine had stop-start but no, it was still running but just incredibly quiet.
We’ve put a deposit down. It’ll go to the aforementioned place to have a service and another friend of mine who has his own garage opposite will have a good look as well to make sure it’s all OK.
So thanks everyone for the suggestions.