Alf Dubs came to the UK on the Kindertransport, aged six, as a refugee from Nazi-occupied Czechoslovakia; he later served as an Labour MP, minister and peer. On Thursday night another former refugee – Sagal Abdi-Wali, who fled the Somali civil war aged seven – was elected the Labour MP for Holborn. Other refugees Rita Ora (Kosovo) and M.I.A. (Sri Lanka) went on to top the charts; Ncuti Gatwa (Rwanda) played Doctor Who. I begin with this not to make the point that refugees can go on to do great things. That’s true, but professional achievement should not be the...