Cheers guys, that will keep me busy.

I think the engine/exhaust noise could be just in one place but is making different sounds at different revs.

I will check the sepentine belt as I hadnt thought of that and its easy to get at.

The window was the front one, and this noise seems to come and go, at the moment its gone so I'll forget that for the time being!

I've got pleanty to check for the time being, thanks again.