Finally I cornered it in the TV room, a gas detector to protect against leaks in the gas fireplace.

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Mr. Collins put in a gas-leak detector and consults his wife before eating leftovers.

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He said the challenge for them was to make the 204 flames "as low-key as possible", which meant that the equipment for each flame had to be as small as possible, including electrical wiring, the gas supply and a flame detector.

BBC: UK