[Bagheera]

UPDATE:

Got the car back today.

Garage suspect an airlock, no issue with Head Gasket and they couldn't find any leaks.

I've taken it for a good 40 minute drive tonight. No repeat of the last events but not quite perfect.

When I slowed down quickly the engine temp gauge went up for a brief period before going back to centre (is this down to the sudden loss of airflow over the engine?).

As I was coming to the end of my drive going up a hill, i got "Heavy Load, shift down" then High Engine Temp, reduce speed. Both quickly went.

On returning home, coolant had dropped, just below min, nothing like before. Could still be some air in the system? There was no steam and the car didn't seem to be excessively hot.