“the essential question for the court is whether the alleged discrimination, that is, the difference in treatment of which complaint is made, can withstand scrutiny. Sometimes the answer to this question will be plain. There may be such an obvious, relevant difference between the claimant and those with whom he seeks to compare himself that their situations cannot be regarded as analogous. Sometimes, where the position is not so clear, a different approach is called for. Then the court’s scrutiny may best be directed at considering whether the differentiation has a legitimate aim and whether the means chosen to achieve the aim is appropriate and not disproportionate in its adverse impact.”
“The need for bright line rules in administering social security schemes has been recognised domestically, for example in R (RJM) v Secretary of State for Work and Pensions[2008] UKHL 63 ,[2009] 1 AC 311 .”