Boris Johnson insists the Government's failing Test and Trace system does provide "value" for money as its total budget soared to £22 billion.
The Prime Minister admitted there had been "teething problems" but defended the eye-watering cost of the centrally-run scheme which has been heavily criticised for its failings.
About four in 10 contacts of those who test positive for the virus are still not being reached, according to the latest figures.
The Prime Minister announced an extra £7 billion for Test and Trace in his winter plan on Monday in a bid to increase testing and improve contact tracing.
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