Ok so I just went out and had a look at the coolant. The radiator / reservoir are chockers.

The dipstick shows about half between L and H (would expect this old girl to use a bit of oil).

I area around the oil fill cap looks to have a bit of fresh oil around it. Checked the cap and it seemed tight.

Started the car and the noise wasn't there on idle but did start once I revved the engine but stooped when the car went back to idle.

I then turned it off and back on and the noise was there at idle. And once I turned the car off it made the noise for about 3 seconds and then stoped?