2006 R32 Glass rattle type sound at cruise 50-60

[minieggs]

Hi All

I have an 06 Mk5 DSG (R32 probably not important to this) with 160k on the clock and it is generally running well

I'm just trying to get rid of as many squeaks and rattles as possible

Apart from the odd creak from the centre console which I can live with

There is a what sounds like a rattling pane of glass sound when running at about 50-60mph

All windows/sunroof are closed and I don't think it is actual glass rattle it just sounds like it

It's not the A/C fan

It does not do it over bumps only at steady state cruise at around 60mph

It sounds like it is coming from the base of the windscreen

Any ideas ?

Anyone had anything similar ?

Thanks