Weird one, this. Today teh girlfriend and I had a leisurely day on Frinton Greensward, flying kites. After which we went for a bit of a drive, all low speeds (circa 20mph average) around the local area, very sedate apart from one quick 0-60 dash. Just as reversing onto the driveway, the animated Coolant Temperature warning came on the DIS, but the gauge still read 90. I shut the engine down and then restarted and no warning. I'll be keeping my eye on it, won't now be drinving the car until the 50 mile round trip to work tomorrow. Thermostat, water pump both changed 4000 miles ago, coolant fill to proper level. I'm fitting a new pair of lower door trims on Tuesday, maybe that will cure the problem?