Traffic has been stopped on the M20 following a two-car crash and oil spillage on the first day of Operation Brock. Drivers heading on the London-bound route between Junction 9 for Ashford and Junction 8 for Leeds Castle have been brought to a halt. It comes after a HGV broke down earlier this morning, causing heavy delays on the carriageway. The lorry has since been recovered but now the crash has caused further delays, leaving drivers stuck in seven-mile queues. The incident involves two vehicles and there are also reports of an oil spillage on the road. Last night, the controversial Operati…