Thanks for the ideas guys. Havnt had a chance to look at it today as it was too dark after I finished work.

Due to extremely cold weather recently could the Thermostat be “Frozen” in the closed position therefore stopping the coolant flowing around the engine? Just a thought I had today!

The car is a 1996 Toyota Carina E 1.6 Petrol, 85,000 miles. Its our old admin car!