Update. Picked car up on Saturday morning and so far so good. I did have a look at the new Mazda 6 but as I want a petrol auto, the best option is the SE-L which means I would loose the Bi- Xenon headlights, heated front seats and the Bose stereo which are three of the reasons I bought the car. I also looked at a twelve month old Mercedes C Class, but was dissapointed with the refinement for a luxury brand and interior space was a lot less than the 6.
If the car continues to run okay, I will probably keep it a while longer.