A friend told me there was a pool of water where I had been parked the other night.
Checking the water yesterday morning it was way below minimum so I put 500ml water in and stopped off on the way to work for some anti-freeze topping it up to max with 500ml coolant.
Checked this morning and it is still at max but concerned about a possible leak and what it could be. I dont want to be without the car for work tomorrow and am doing a 240 mile round trip at the weekend. Any advice welcome.