Delegated legislation - meaning, growth, classification (title-based, discretion-based, purpose-based); permissible and impermissible delegation; doctrine of excessive delegation (In re Delhi Laws Act, Hamdard Dawakhana); Henry VIII clauses; sub-delegation (delegatus non potest delegare); controls - parliamentary, judicial, procedural; judicial review grounds (GCHQ - illegality, irrationality/Wednesbury, procedural impropriety, proportionality); writs under Articles 32 & 226; five writs - habeas corpus, mandamus, prohibition, certiorari, quo warranto; PIL and liberalisation of locus standi.