Boris Johnson says contact tracing should only force a very small number of people into quarantine

The best estimates suggest that if there are 10,000 fresh cases a day, then as many as 390,000 new people would be quarantined each day
This is the second time I've heard this claim today from someone high up in the contact tracing scheme

I think we're roughly close to 10,000 new cases a day at the moment - so I wonder what's changed since @AdamJKucharski et al published this paper?
https://cmmid.github.io/topics/covid19/reports/bbc_contact_tracing.pdf
Now Boris Johnson says he's set a target for all tests results to be returned in under 24 hours

Is he aware that his team believe doing home tests this quickly is impossible - for the understandable reason that it's impossible to teleport swabs? Or is he ditching home testing?
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