Hi all,
Sorry this has taken a good bit of time to sort out.
There were two issues, firstly a badly sealed rear window. I had it removed, cleaned re-sealed by a local bodyshop.
I still had water in the boot and then secondly, found that there are two air vents, under the level of the rear lights and hidden by the bumper, which were not fitted correctly.
Hope this helps.
Thanks,
Raymond
Hope this helps