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Any face covering will do according to the news item I saw at around 10am on 12/5/2020 on Sky News. I'll watch the news again at 11 and see just how much the information has changed. It'll be something along the lines of 'do wear a mask, unless it's not a mask, in which case make sure you're 2m away from your daughter, unless she's your cleaner, in which case you can see her at your house, without a mask but with alertness'