R (Carson) v Secretary of State for Work and Pensions

Article 14 ECHR discrimination analysis distinguishes 'suspect' or core personal grounds (race, sex, etc.), which require weighty justification, from other grounds (such as place of residence) where the court accords the legislature a wide margin and asks only whether the difference in treatment is reasonably justified; like cases must be treated alike and the comparison must be between persons in analogous situations.