I just put my son in the back of the car (nearside) and the seatbelt was soaking wet. It appears water has been coming through the hole in the trim covering the C pillar. On removing the soaked booster seat the sound proofing and carpet under the rear seat is also soaked so this obviously isn't just a couple of drops. Anyone had this before?

I had the same problems with water under the rear seat (seatbelt was dry). I removed the rear lights and the wiring loom gasket had failed. fixed it with a load of silicone around it, (let it dry before putting the light back on)

Thanks for your reply but I'm guessing where the water is coming into the cabin (the seatbelt entry) is higher than the lights it's probably not that. I'll check it out when I get some time anyway.

Could it be getting in from behind the c pillar?

Matthewr1990 said:

Could it be getting in from behind the c pillar?

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It is, yes. I'm guessing somehow it's leaving down from the sunroof.

Sunroof seems very plausible. Is the headlining wet at all?

Sun roof drains run down the 'C' pillar each side.

Remove the 'C' pillar internal trim and all will become apparent, will be worth checking if the drainage hose has become damaged or detached

Sounds like the culprit. I called the dealer this morning as they did as lot of work to the skydome last summer. They want it in to investigate.