Why has it taken the UK so long to introduce mandatory face mask wearing on public transport? In this special edition of the Leader podcast, we speak to a physician who has been campaigning for the change since the pandemic began, Dr Babak Javid. The Evening Standard's health editor, Ross Lydall, tells us how the law will be enforced, and we hear from Kerry Macphee, the Commonwealth Games competing cyclist who has joined a cottage industry of face mask makers around the United Kingdom.

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