Mack and Jones are back in one room and the mojo is undeniable: first we check in on the latest bastion to fall to the inexorable creep of facial recognition: Scottish lunchrooms. Then, we delve into the hair-rising possibility that the veil of anonymity long enjoyed by some of our nation's most vital and, indeed, virile heroes, sperm donors, may soon be torn away. Then it's on to another type of anonymous shooter as we talk the rise of 'ghost guns' and 3D-printing assisted criminality in general.