This. With the orginal battery being 10yrs old, it's unlikely to hold enough charge for the stop start to kick in. If replacing battery, you'll need to check (from an authoritative source, not a teenager in Halfords who likes to say yes) that the type you buy is suitable for stop start....if it's a function you care about.ours has stop start, it only ever works with a new battery, or after a 200 mile run,
battery needs to be fully charged,


