What we do (and don’t) know about ‘illegal migrant’ numbers

A Telegraph article claiming up to one in 12 people in London are “illegal migrants” has grabbed headlines. But estimating how many people are in the UK illegally is inherently difficult

What we do (and don’t) know about ‘illegal migrant’ numbers
A Telegraph article claiming up to one in 12 people in London are “illegal migrants” has grabbed headlines. But estimating how many people are in the UK illegally is inherently difficult