It's a vintage mystery - who is dumping dozens of sauvignon blanc bottles in the lanes between two pictureseque villages? Residents of Hotham and North Cave, in East Yorkshire, say bags full of empty bottles have been turning up on grass verges for months. One farmer, who asked not to be named, showed the BBC his latest haul and said: "The most I've collected in one day is 48." East Riding of Yorkshire Council said it was unaware of any particular issue in the area and encouraged residents to report every incident of fly-tipping. On a local WhatsApp group, a team of residents frequently discuss how many bottles have been collected. Many have been found on leafy Pitbalk Hill on the way into Hotham. With its cream-coloured, old stone buildings and blankets of bright yellow daffodils, the village appears to be an unlikely location for fly-tipping, even if the litter in question retails at more than £10 a bottle.…