After it has sat a while, I bled it up and drove it home.
Heaters are nice and toasty - I kept them open til the car reached normal operating temp 90degrees on the gauge.
Then I switched off the heater and continued to drive along the motorway.
Got home and this is how it was.
Now I just need to wait until tomorrow and check the coolant level tomorrow when cold.
Current thinking is drive it to work gently on monday- 60/65mph. Then if coolant level looks ok before I come home, I'll give it a rag home over the hill
