I’d like to say this could be the case but... embarrassingly... I haven’t driven her since Christmas morning...As above but the tub is also prone to ingress from the seals... water passes in whist driving.
Plastic trims are not clogged? Why could that be an issue? They are a bit dirty to be honest!Check the plastic trims in the boot shut are not clogged up underneath and also water has been known on this model to be coming through the rear lights.
We have one in at the moment with the same issue, will report back when we find it.