In R (MAS) v SoS for DEFRA (2019) EWHC 158 (Admin), Morris J, at paragraphs 53/54, stated the principles of proportionality as follows:-
(1) Proportionality is a general principle of EU law;
(2) Its application in any particular case is always highly fact-sensitive;
(3) It applies to national measures falling within the scope of EU law;
(4) It applies only to measures interfering with protected interests;
(5) Protected interests include the fundamental freedoms governed by the EU Treaties;
(6) Where the issue is the validity of a national measure, it is for the national Court to reach its own conclusion on proportionality; Read more »