Hi During the summer I had a problem with my car overheating if I was stuck in traffic for anything over 15 minutes and now in winter the needle is failing to reach the normal mid way point on the gauge. I did ask the garage to check it when it went in for mot in September but they couldn't find the problem, any suggestions on what it could be,cheers

Could be a faulty temperature sensor if you've done all the obvious of changing coolant and bleeding all airlocks.

Thanks Gibbo will have a look at that, would the sensor still give a reading if it was faulty or would the needle not move from the left on the gauge

Faulty thermostat?