Permits and ID cards required to work in Northern Ireland

"My late mother, Emily Beatrice Groves (née Young) trained and practised as a nurse in the Royal Victoria Hospital, Belfast in the 1940s and also worked as ‘Matron’ at the Royal School, Armagh from 1950-1954. Among her possessions I found her Temporary ID card, Residence & Employment Permit Cards and her Travel Permit Card. With Brexit looming, you could be forgiven for doing a double take when you see these...."