At a national level, a survey by insurer Direct Line published in December suggested that nearly four million UK adults might be living in a home without any smoke alarm at all. In the US, an estimated 16% of households do not have a functioning smoke alarm.
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She also criticised the PM for citing his own experience as a father of two teenage children on social media, arguing that this did not make him an expert on the subject and that his family were "sheltered" compared to others.
The journey home took 17 hours.
"It wasn't just a few colonies that were lost and it wasn't a slow process," he says.