Rear Window Rattle ?

Hi Everyone,

Hoping someone on here can point me in the right direction before i go insane with this car !!

I've had a search on here about the Renault Rattles, and from what i've read, it's boot latches, seatbelts, spoiler etc. Mine however seems to be coming from the rear window on the passenger side. Only happens when i go above 50/55mph, and is a constant rattle, it sounds as though the window is rattling against something, but there is absolutely no play in it whatsoever! I took my missus to the airport the other morning, and i dont know whether or not it was a fluke, but the rattling stopped and i think it might be because her suitcase was in the boot. I was able to cruise at 70 and there was silence. on the way back, sure enough, rattling like fook.

I'm travelling to the UK in the next couple of weeks, and i do not want that noise for hours and hours.

Absolutely any guidance,tips, hints anything will be massively appreciated !!

Thanks,
Andrew.