Article continues below advertisementKing Charles is facing an unusually earthy dispute with his eldest son, Prince William, as plans for a vast manure storage pit on the Sandringham estate risk igniting a quiet but serious family row.OK! can reveal the proposal centers on a large slurry pit planned for land owned by the King on the Sandringham estate in Norfolk. According to planning documents submitted to King's Lynn and West Norfolk Borough Council, the facility would sit less than a mile from , the Grade II-listed Georgian home occupied by William and his wife, Kate Middleton, 44.