Operation Yellowhammer NewsLatest News On Operation Yellowhammer Ten scenarios outlined in Operation Yellowhammer12/09/2019 11:01:00 UK govt releases 'worst case' details on no-deal Brexit11/09/2019 23:42:00 'A few bumps in the road’: Number 10 attempts to downplay Operation Yellowhammer revelations19/08/2019 14:20:00