War and armed conflict — Civil war — Insurrection — Civil strife in Mozambique — Whether Renamo Movement engaging in civil war, rebellion or insurrection against Frelimo government — Relevance of support from South Africa — Whether strife internal and spontaneous — Whether Renamo having clear aim to overthrow Frelimo by violent means notwithstanding external support — Whether aim political — Whether long term strategy necessary — Relevance of terror tactics — Whether sufficient popular support — Whether attacks on plaintiffs’ pipeline and oil tank forming part of insurrection against Frelimo government — Whether losses caused by civil war, rebellion or insurrection — Meaning of these terms in insurance policy — The law of England