xsara noise?

i get a very irregular squeal/rattle noise from under my xsara bonnet ,nothing when still only when moving,have replaced water pump and auxillary belt tensioner,other pulleys seemed fine no noise when spun ,smooth spin,noise doesn't increase when engine is revved highly,definately sounds like a revolving noise ,am wondering whether its suspension or drive to wheels,timing belt only 5000 miles old,dont think its brakes squeal,am really stuck ,please help any advice would be appreciated