I have an issue with my car, it was previously over heating, I took it to a garage about a month ago, who identified that the Radiator needed replacing which they did. Now tonight, took it for a run down dual carriageway for about 4 miles, then city driving for about 2 miles and the temperature gauge zoomed straight up to red area, I pulled over to let it cool down, 5 mins later I drove to home (about another half mile) and flipped the bonnet. Checked the levels, all fine, I checked the oil for white goo, nothing. Totally at a loss, at the cause. My car is standard running 300 BHP (Prodrive upgrade from new), I’ve owned the car 9 years, it has 85k on clock and never wanted for anything. Any advice would be greatly appreciated.