Hi Billyboy

Had this problem when I first got my Tub and no one had any good ideas for me either.

Finally traced the problem to a blocked drain hole in the bottom of the rear wing where the inner and outer panels meet.

shoved a plastic tie wrap up from underneath and tha water came flooding out.

I then washed out all traces of muck from inside the boot.

Been bone dry ever since!

Hope that helps.

Ian