yes mate
the only 2 drains i can find are around the "B" pillar
they exit under the rear wheel arch 2014 L494 5.0 SC
2014 L538 2.2 SD4

Thanks mate, just located them.

Good news is they are still draining, bad news is I can see from the top they are beginning to corrode!

Just now need to decide on if I have a go myself or ask my local indie to swap the steel tube.

I wonder if some rust eater in the top would prelong their life?

Not sure I fancy pulling on the headliner or pulling strips off the roof!