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.
Along with the jubilation at the long-awaited project — which has been in the works for decades and has two more westward extensions that will open in 2027 and 2028 — there was much astonishment at Metro embracing the cheeky tagline.
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