British warships exit Gulf as Iran conflict looms for US - serving Royal Navy officer told The National that it was “symptomatic of decades of under-investment”

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Lizzy Yarnold

There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.