Thatcher also continued the "Ulsterisation" policy of the previous Labour government and its Secretary of State for Northern Ireland, Roy Mason, believing that the Unionists of Northern Ireland should be at the forefront in combating Irish republicanism.
Thatcher tamén continuou a política de «Ulsterlización» do anterior goberno laborista e o seu secretario de estado para Irlanda do Norte, Roy Mason, crendo que o unionismo de Irlanda do Norte debería estar na vangarda para combater o republicanismo irlandés.