So my car went into WMB yesterday for the cold issue, and now its toasty warm with a new thermostat and temperature sensor. MPG has pretty much doubled as it was running on a cold start effectively. Big thanks to the guys there, it wasn't easy for them dealing with me, the warranty company and the garage I bought the car from, but they stayed late last night just to get it ready for me. I'd certainly use them again, but will possibly use the Darlo outfit next time just to see if getting there is any easier