Had a quick search, but found nothing relating.
Had some time over the holiday period to upgrade my pcv hoses and was surprised to find the engine bay dripping with water. Together with the underside of the bonnet dripping wet too. Granted I haven't used the car for a fortnight, but still wouldn't expect that. This didn't happen last winter, however it was nowhere near as cold here in the West Midlands.
So apart from "drive the car more comments" is this common and anything to do with the ally bonnet?