Nothing reduces the risks to zero other than standing in a meadow completely on your own ad infinitum with nobody coming within three metres of you.
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Notes from Wikiquote
Quote from part of a Downing Street press conference.
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Quote text and notes from Wikiquote: Jonathan Van-Tam (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.