Hello Rob, Apologies for highjacking this thread, but how long have you owned the car, has the battery been replaced during your ownership, and do you have any service history evidence that it has been renewed in the car’s lifetime? If it turns out that the battery is the original, then I would simply renew it anyway. Re. non working stop/start. Clap your hands, since this is the most engineeringly averse system devised during the history of motoring. As Cliff points out, a new battery will need to be coded to the car. Regards, Gareth.