Since I’ve posted this thread I’ve had nothing but problems. Dealer was apologetic. The battery was replaced as a gesture of goodwill , and we had high hopes perhaps the turtle would P off.
Nope.
The high/low turtle likes to appear whenever the technicians are not in of course, but he has appeared in the last three drives - if he appears tomorrow the car is getting lobbed at their front door.
Today I was greeted by a turtle and a bunch of christmas lights shouting about my brakes mostly but not quite the brake assist issues people are reporting. The engine had started though, so I wasn’t thinking battery.
After a few restarts the engine light was the only thing that remained on. I refused to chance it

on the motorway so I drove the HRV instead. When I got back home I tried the Crosstar again, a few restarts and the engine light eventually went off.
I’m tired of it. I love the car but the mystery of all these errors is wearing thin and I’m a bit worried about the school run tomorrow. Today is the first time I genuinely miss my MK2

I feel unsafe now and it shouldn’t be this way