Lucky for me I do have homestart lol. But I will dig my tools out in the morning and do what you say and see if the pump is leaking, however, I am thoroughly confused again.
I unlocked the car and popped the bonnet, opened the window and started the engine, the noise was still there but slightly quieter from memory, the header tank is still half full, I opened the oil cap with the engine running and the noise seemed louder, I only opened the cap for about 2 seconds and of course it changed the sound of the engine, So I closed the bonnet and decided to go for a 3 mile round trip run, Drove perfect, when I got back I parked up, popped the bonnet and the engine was idling perfectly and quietly (No noises as all), coolant still at same level, no obvious signs of anything.
Any Idea's please? I am desperate!
Cheers.