State immunity — Jurisdictional immunity — State Immunity Act 1978 — Section 5 — Claim for personal injury and damage to property — Whether Section 5 limited to acts undertaken jure gestionis — Whether Section 5 including acts undertaken jure imperii — Whether Section 5 limited to cases where all acts or omissions completed within United Kingdom — Whether Section 5 applying to composite acts — Whether electronic device manipulated within United Kingdom by electronic device abroad an act undertaken within the United Kingdom — Evidential requirements of Section 5 — The law of England