Thanks campbeam. I note your 10 years comment. All I seem to be able to find is people saying "lifetime of the car" or just anecdotal comments like "mine needed replacing at xx years" where xx is often 11, 12, 13 and other comments like "mine is find at yy years" where yy is often up to 15. Really hard to get any idea what the average is, what an upper and lower decile might be.
Interestingly the faults have all cleared by themself 2 days after they first appeared. Was not expecting that. I'm still booked in for a new battery next week. Worries me that it could've just been some fla