Guardian: Farmers in Kenya are dumping tonnes of vegetables and flowers destined for the UK, four days after the volcanic ash cloud over Europe grounded cargo shipments from Africa. Kenyan farms have laid off 5,000 staff, and growers have warned thousands more workers could be told to stay at home if flights did not resume by Tuesday, which would deal a serious blow to the country’s economy. “We usually ship 10-15 tonnes of produce every day to different parts of the world and that’s …