Hundreds of farmers have demonstrated against the expiry of tax refunds for agricultural diesel with a protest drive around Germany’s busiest airport in Frankfurt. According to a police spokesman, the farmers set off towards the airport at around 6 am (0500 GMT) on Saturday morning. Up to 2,000 tractors had been announced, but initially far fewer turned up. By early Saturday morning there were 500 to 600. A protest drive around the airport site was planned. The police expected road closures until the afternoon. The airport operator Fraport asked people to travel to the airport by public transp…