Its actually a weird one John, It reads normal but sometimes it seems to stick. Reads zero whilst car is warming up but then rises quickly.
I made another post about car going into limp mode without throwing up a warning light/code. Its been happening only since I had it remapped. Fahad has suspected it may be temp sensor as car has had an egr-delete and egr operation is related to coolant temp. Was just a possibility until I noticed last week that I had been sitting in traffic for ages and it was stuck oin zero. I shut down/restarted the car and it went into limp mode. I restarted the car again and it ran normally, with the temp gauge reading normal. Its only a £10 part so was going to try it until I am able to get up to Fahad's.