“My Lords, I accept, as both counsel agree, that in a cause where there is an issue involving a public authority as to a question of public law, your Lordships have a discretion to hear the appeal, even if by the time the appeal reaches the House there is no longer a lis to be decided which will directly affect the rights and obligations of the parties inter se. The decisions in the Sun Life case and Ainsbury v. Millington (and the reference to the latter in Rule 42 of the Practice Directions Applicable to Civil Appeals (January 1996) of your Lordships' House) must be read accordingly as limited to disputes concerning private law rights between the parties to the case. The discretion to hear disputes, even in the area of public law, must, however, be exercised with caution and appeals which are academic between the parties should not be heard unless there is a good reason in the public interest for doing so, as for example (but only by way of example) when a discrete point of statutory construction arises which does not involve detailed consideration of facts and where a large number of similar cases exist or are anticipated so that the issue will most likely need to be resolved in the near future.”
“...conclusion that provisions of the VCDR are incompatible with the ECHR could have far reaching implications, particularly in the context of the UK’s diplomatic relations. The VCDR operates on the basis of reciprocity and is the foundation of the legal framework for the conduct of international relations. The practical impact of a divergence in the interpretation of the VCDR in this jurisdiction cannot be overstated. The likelihood is that any such interpretation by the UK will simply place the UK out on a limb in relation to the other 190 states.”