If you watch television at all, you have probably seen the Van Tulleken brothers. Chris and Xand are handsome, privately educated doctors, separated by seven minutes in age and half an inch in height. They present the sort of programmes where posh people in white coats tell the rest of us what to eat.

In fairness, they also do a lot of humanitarian work. That made them naturals for Frontline Doctors: Winter Migrant Crisis (7 March), a documentary that followed the bleak midwinter trail from Lesbos, through Athens, Montenegro and Serbia, to Germany or Calais. Their angle on this tragedy, unfolding every night on the Ten O’Clock News, was to concentrate on medical problems and provision. Inevitably, they saw much more than that, which made for affecting television.

On the former holiday island of Lesbos, they were there when early-morning volunteers directed the barely seaworthy rubber boats on to shore. The boats can be had for €700 (£540), with an engine costing another €500. Each of the 50 passengers aboard was probably paying €1,000 for the privilege.