Hello, thanks for allowing me to join your forum.
I have a 2013 Astra Tourer Auto 2.0 CDTI SRI which I'm very fond of and have owned since Sept 2016.
It's been faultless in the time I've owned it, and has done about 54000 miles, normally goes very well, and has full Vauxhall history.

Today, however after an 8 mile drive at fairly low speeds it broke down.

I had just negotiated a roundabout when a message came up on the display "Stop Vehicle Immediately Engine Has Overheated"
I pulled