Jurisdiction — Executive — Foreign court seeking order to examine Crown servant — Hague Convention on the Taking of Evidence Abroad in Civil or Commercial Matters, 1970 — Whether English court having jurisdiction to make order — Evidence (Proceedings in Other Jurisdictions) Act 1975 — Act only basis for jurisdiction — Potential witness no longer Crown servant — Whether Section 9(4) of Act applicable

Relationship of international law and municipal law — Treaties — Convention applicable only to extent incorporated into municipal law by Act — Where ambiguity in Act presumption Parliament legislating in accordance with Convention — Whether any ambiguity — Article 11 of Convention — The law of England