Many thanks for your reply, the sound is coming frm the very top of the engine, if you are looking at the engine in front of you it will be from the back of the head area. It sounds to me like tappets, like a fluttering sound. Worse as you get higher in the revs. I will try and capture the sound and add it on a link.
It starts at 2,200 revs and stays there, gets louder when you push the accelerator and it feels as if it slightly looses power on the pull.
I did just have the cambelt and head gasket changed, i was told it was possible the timing belt that is out. I did drive it from Hermanus to Cape Town and back, approximately 260kms...
Also, and this is strange and unsure if it is connected, whilst idling, the temperature goes up to half,as normal. When on the open road it stays at zero and i dont get very hot air with the heaters full on?!!