This edition goes undercover to investigate the booming business of fake passports and the state of Britain's border security, as Jonathan Maitland visits Greece to expose the secret trade in dodgy documents where a fake passport can be bought for just 500 pounds, before speaking to Home Office whistleblowers who reveal their concerns about the way Britain's borders are policed. With the Brexit vote pushing control of UK borders to the forefront of the political landscape, this programme asks if such control has already been lost - and whether things are going to get worse rather than better.