Hi can anyone help I have a 2015 XF estate and have been getting low battery messages when I press start button I also haven’t been able to get stop start eco mode any suggestions Jamie

 

I mean, not to state the obvious, but the car's literally giving you a pretty big clue and you didn't mention if you had checked/replaced the battery in your post. It might be the original and 5 years wouldn't be unheard of.