Car has been parked up since friday evening and not driven till today (sunday morning) it has been sat in the rain all locked up as you would expect. However the boot carpet and the parcel shelve as well as the rear seats are all wet / damp. Windows are all fine all the seals are dry, checked the rear lights all nice and sealed and dry rear window boot rubber seal also dry. Could the third brake light be causing this problem ?

That would be favourite to look at, it's secured by 3 x Torx screws.

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Well well how right you are! removed the trim at work and sat in the back of the car as one of my work mates sprayed the back of the car. It didnt take long to be honest I may as well not have had a brake light as the water just poured in! So its back to BMW for that and other little niggles they have to sort.

Thanks for info buddy

No problem Mark

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Well thats the boot leak all sorted brand New Rear Brake light along with a New Rad, New Rear Discs and Pads, New Battery Cover, New Rear Wheel Plastic Black Wheel Arch all paid for by Mini under its Cherished Warranty.

Down side is they gave Rita a new Mini cooper to drive around for the last four days and she dont to give it back !!!!!!!!!!!!!!